FORM - 2
THE PATENTS ACT, 1970 (39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE
SPECIFICATION
(See section 10; rule 13)
FIREARM COMPRISING A SLIDE-STOCK LOCKING BOLT
FABBRICA D'ARMI PIETRO BERETTA S.p.A.
an Italian Company
of Via P.Beretta, 18,1-25063 Gardone Val Trompia,
Brescia, Italy.
Inventors:
1 GENTILINI Claudio 2. PRANDINI Giovanni
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

DESCRIPTION
The present invention relates to a firearm. Specifically, the firearm which the present
invention relates to presents a new specific structure to facilitate the dismantling and
assembly operations thereof.
In particular, the firearm which the present invention relates to is a semi-automatic
firearm, preferably a gun.
In the prior art firearms comprising specific locking systems able to keep the firearm
in a predefined position are known of, specifically, in fact, systems are known of
comprised in the firearm, the aim of which is to keep the moving parts connected to
the fixed parts, in other words systems are known of able to keep the slide operatively
connected to the stock.
Such systems must thus satisfy the requirements made of a firearm in a configuration
ready to fire, that is to say eliminate the risk of accidental dismantling, for example
following firing or a fall, and the safety requirements for performing dismantling
operations of the firearm, which must in fact take place without risk to the user
performing such operations.
However, of the two needs mentioned above, the prior art has always focused on the
first problem, sacrificing in part the second.
Said systems usually comprise at least one transversal element, for example a bolt,
which inserted along an axis transversal to the longitudinal axis, axis along which the
slide extends, is suitable to act in conjunction therewith to keep it connected to the
stock.
In the prior art the assembly and dismantling operations of the firearm are therefore
particularly complex, requiring, on the part of the user performing them, particular
care and skill.
The systems currently known of are usually structured in such a way that, in the
dismantling operations and vice versa in the assembly operations of the firearm, the
user must use both hands in perfect synchrony, holding the slide in a rearward
position, overcoming the force of the recoil pin acting thereon, and in that instant draw
the bolt into a predefined position permitting the extraction in a forward direction of
the slide, detaching it from the stock.

In some embodiments, said systems also comprise further special components suitable
for blocking the slide in said rearward position while the operations on the bolt are
being performed.
The dismantling operations are thus, as well as complex, particularly risky to the user
in that, should he lose grip of the slide in the rearward position, this could snap
forward, moved by the spring, and thus strike him.
The purpose of the present invention is to make a new firearm in which the
dismantling and assembly operations are simplified and less of a risk than those to be
performed in the firearms comprising the systems of the prior art; the firearm which
the present invention relates to achieves such purposes by keeping the slide blocked to
the stock in a completely safe manner.
Such purpose is achieved by a firearm according to claim 3. Further advantages and
characteristics of the firearm according to the present invention will instead be evident
according to the dependent claims.
Specifically, the firearm which the present invention relates to proves to have a new
and innovative structure, and in particular a new bolt, such as to make the dismantling
and assembly operations simpler and safer than the devices typical of the prior art, all
while keeping the moving parts locked to the fixed parts once they have been
assembled.
The characteristics and advantages of the firearm will be evident from the description
given below, made by way of a non-limiting example, with reference to the attached
drawings, wherein:
- figure 1 shows a perspective view of a firearm which the present invention relates to,
according to a preferred embodiment, in a configuration ready to fire, according to the
present invention, wherein the bolt comprised in said firearm is in the locked position;
[0001] - figure la is a transversal cross section of the firearm shown in figure 1, while
figures lb and lc are respectively a view from above and a longitudinal cross-section
of the firearm shown in figure 1;
-figure 2 shows a perspective view of a firearm which the present invention relates to, in a configuration wherein the bolt is translated to a new position;
- figure 2a is a view from above of the firearm shown in figure 2, while figure 2b is a

longitudinal cross-section of the same;
- figure 3 shows a perspective view of a firearm which the present invention relates to, in a dismantled configuration, wherein the slide can be dismantled from the stock, wherein the bolt is rotated, and positioned in a release position;
- figure 3a is a transversal cross section of the firearm shown in figure 3, while figures 3b and 3c are respectively a view from above and a longitudinal cross section of the firearm shown in figure 3;
- figure 4 is a transversal cross -section of the firearm which the present invention relates to, wherein the slide 3 is dismantled from the stock 2;
- figure 5 is a perspective view of the bolt comprised in the firearm which the present invention relates to, according to a preferred embodiment;
-figures 5a, 5b, 5c are respectively a further perspective view, a view from above and a front view of the bolt shown in figure 5;
- figure 5d is a cross section view of the bolt according to the section plane V-V as in figure 5c,
- figure 6 shows, in perspective, the support frame comprised in the stock of the firearm which the present invention relates to, according to a preferred embodiment;
- figure 7 shows, in perspective, a spring-holder and a spring comprised in the slide of the firearm which the present invention relates to, according to a preferred embodiment.
With reference to the appended drawings, reference numeral 1 globally denotes a
firearm in its entirety; preferably said firearm 1 is a semi-automatic gun.
The firearm 1 comprises a stock 2 and a slide 3; preferably the slide 3 extends along a
longitudinal axis X-X and is suitable for translating along said axis; preferably the
slide 3 comprises a barrel 31.
In a configuration of firearm ready to fire, the slide 3 is preferably engaged with the
stock 2; the slide 3 comprises a spring-holder 35 and a recoil spring 30 positioned on
said spring holder 35, said recoil spring 30 acting on the spring-holder 35 and thus
suitable for keeping the slide 3 in a forward position and the firearm 1 ready to fire,
that is to say in a position in which the firing cycle is suitable to commence.
The stock 2 is, in addition, suitable to contain a support frame 10, specifically suitable

to support a firing mechanism 600, preferably comprising a trigger and a plurality of
linkages, or general transmission means suitable for transmitting the movement of said
trigger to the relative means provided for the firing operation.
Preferably, said support frame 10 is suitable for carrying out said reciprocal
engagement between stock 2 and slide 3.
In addition, according to a preferred embodiment, said support frame 10 is housed at
least partially in the stock 2. In turn, preferably, said support frame 10 extends along
the longitudinal axis X-X.
In a preferred embodiment, the firearm 1 comprises, in addition a bolt 50 which
extends along a transversal axis Y-Y, transversal to the longitudinal axis X-X;
according to a preferred embodiment, said axes extend in directions perpendicular to
each other.
In addition, preferably, the bolt 50 is translatable and rotatable along said transversal
axis Y-Y.
In a preferred embodiment, the bolt 50 is engageable with the stock 2 and/or with said
support frame 10; preferably, in addition, as illustrated below, depending on the
embodiments the translation and rotation of the bolt 50 is substantially linked to the
type of engagement thereof with the firearm 1, and in particular with the stock 2 or
with the frame 10 depending on the embodiment.
Preferably, the bolt 50 is suitable for assuming a locking position in which the slide 3
is locked to the frame 2, preferably by means of the support frame 10, in such a way
as to be free to perform the specific arming movements of firing, and a release
position in which the slide 3 is detachable from the stock 2, by means of dedicated
operations performed by the user.
In other words, once inserted in the firearm 1, the bolt 50 has the purpose of joining
the stock 2, in particular by means of the frame 10, with the slide 3, being engaged
with the spring-holder 35; stock 2 and slide 3 are thus kept in a position ready to fire.
According to a preferred embodiment, the bolt 50 comprises a spring-holder seat 500;
in said spring-holder seat 500, when the bolt 50 is placed in the locked position, it acts
in conjunction with the spring-holder 35, specifically with an engagement end 350 of
the spring-holder 35. The spring-holder 35, specifically, the engagement end 350

thereof, which acts in conjunction with the bolt 50, is loaded by the force of the spring
30.
The other end of the spring-holder 35, in fact, is engaged with the front end of the
slide 3, in particular next to the muzzle of the firearm.
According to a preferred embodiment, the spring-holder seat 500 comprises a plurality
of surfaces having a series of well-defined purposes: a support surface 501, on which
said engagement end 350 engages, when the bolt 50 is in the locked position and a
translation surface 502 suitable to permit the translation of the bolt 50 acting in
conjunction with the engagement end 350.
Preferably, in addition, the spring-holder seat 500 further comprises a rotation surface
503 suitable to permit the rotation of the bolt 50 acting in conjunction with the
engagement end 350.
According to a preferred embodiment, the support surface 501 comprises a plane on
which said engagement end 350 lies, when the bolt 50 is in the locked position.
According to a preferred embodiment, the support surface 501 is composed of a
unique plane.
Preferably, the support surface 501 extends substantially along the transversal axis Y-
Y; in addition, preferably, the support surface 501 extends in length for a section of
the bolt 50; preferably, the support surface 501 is a cavity inside the bolt 50.
Further embodiments are provided for wherein the reciprocal engagement between the
engagement end 350 and support surface 501 is improved as a result of the geometries
of the two components: for example an embodiment in which the support surface 501
is concave and acts in conjunction with a convex engagement end 350.
Specifically, the support surface 501 is delimited laterally on one side by said
translation surface 502, and on the other side by a substantially perpendicular lateral
surface 511.
According to a preferred embodiment, the support surface 501 has substantially
complementary dimensions to the engagement end 350.
The translation of the bolt 50 is thus possible in that the engagement end 350 finds
itself laterally encountering the translation surface 502, which, thanks to its
inclination, permits the relative movement between the bolt 50 and the engagement

end 350.
Said translation surface 502 is, in fact, preferably, positioned adjacent to the support
surface 501 and is inclined in relation to it along the transversal axis Y-Y.
In other words, the translation surface 502 is angled or arched so that when the bolt 50
is moved along the transversal axis Y-Y, the engagement end 350 is permitted to
move out of the support surface 501. During such movement the spring 30 is further
compressed.
As said, the spring-holder seat 500 further comprises a rotation surface 503 suitable to
permit the rotation of the bolt 50 when it acts in conjunction with the engagement end
350, said rotation surface 503 is adjacent to the support surface 501 and to the
translation surface 502, thus extending in length along the transversal axis Y-Y. Said
rotation surface 503 is in addition inclined in relation to both said surfaces along the
longitudinal axis X-X.
In other words, the rotation surface 503 is angled or arched so that when it is engaged
by the engagement end 350, the rotation around the transversal axis Y-Y of the bolt 50
is permitted and forced.
According to a preferred embodiment, the bolt 50 extends along the transversal axis
Y-Y so as to project at least on one side of the firearm 1; preferably the bolt 50
extends so as to project on both sides of the firearm 1.
In addition, according to a preferred embodiment, the bolt 50 comprises a translation
portion 51 suitable for being actuated by the user to move the bolt 50 along the
transversal axis Y-Y, and a rotation portion 52 suitable for being actuated by the user
to move the bolt 50 rotationally around the transversal axis Y-Y.
Preferably, the translation portion 51 is suitable for being pushed by the user, so as to
move the bolt 50 in translation. In further embodiments, the translation portion 51 is
suitable for being pulled by the user, so as to move the bolt 50 in translation.
According to a preferred embodiment, the rotation portion 52 extends substantially
radially in relation to the transversal axis Y-Y, so as to allow it to be moved in an
intuitive and simple manner by the user.
According to a preferred embodiment, the translation portion 51 is opposite the
rotation portion 52; so the translation portion 51 projects from one side of the firearm

1, while the rotation portion 52 projects from the other side of the firearm 1.
Preferably, the rotation portion 52 projects from the side of the firearm 1 when the
bolt 50, starting from the locked position, is translated along the transversal axis Y-Y,
after operating of the translation portion 51, for example by pushing thereof.
Preferably, this way, when the bolt 50 is in the locked position the rotation portion 52
is "flush" with the side of the firearm 1, immersed therein, thus preventing lateral
encumbrances.
Preferably, in the passage from the locked to the release position, the translation of the
bolt 50 is performable before its rotation; vice versa in the passage from the release to
the locked position, the rotation of the bolt 50 occurs before its translation. In other
words, the user is prevented from performing the rotation of the bolt 50 before it has
been translated into a predefined position. Preferably, in order to move the bolt 50 into
the release position of the firearm 1, starting from the locked position the bolt 50 must
be translated, preferably by pushing, into a predefined position, where the user is thus
permitted to rotate it and lastly position it in a release position.
Vice versa in the assembly step from the locked position of the firearm 1, the insertion
of the bolt 50 provides for a rotation step before a translation step.
According to a preferred embodiment, the support frame 10 extends substantially next
to the sides of the firearm 1.
Preferably, in fact, the frame 10 comprises a first wing 11 positioned substantially at
the side of the firearm 1, said first wing 11 is traversable by the bolt 50 through a first
hole 101. When the bolt 50 is inserted in the firearm 1, thus through the first hole 101
the engagement between the bolt 50 and stock 2 is created.
According to some embodiments, the support frame 10 comprises two wings, said first
wing 11 and a second wing 12; the two wings are positioned substantially at the sides
of the firearm 1, one opposite the other.
According to said embodiments therefore, the frame 10 extends along the longitudinal
axis X-X with a substantially U or C-shaped cross-section. Preferably, the two wings
11 and 12 are parallel to each other.
Preferably, the bolt 50 crosses both the first wing 11 through the first hole 101 and the
second wing 12 through a second hole 102.

Preferably, the interaction of the frame 10 and bolt 50 directly influences the
movement of the latter. Specifically, in fact, the respective geometries of the bolt 50
and frame 10, in particular of the first hole 101 and/or of the second hole 102, are
designed so that some movements are permitted or prevented only in certain
circumstances, in other words only in some predefined positions between the bolt 50
and frame 10.
According to a preferred embodiment, in fact, the bolt 50 has a flattened portion 55
along its extension, that is to say a flat surface suitable to act in conjunction with the
frame 10; preferably, the first hole 101 and/or the second hole 102 have an irregular
geometry, for example not axial-symmetric, comprising an anti-rotation portion 150,
suitable for interacting with said flattened portion 55.
The interaction between the flattened portion 55 and anti-rotation portion 150 acts so
as to prevent the rotation of the bolt 50 when it is placed in a predefined position
along the transversal axis Y-Y; in other words, when the bolt is positioned so that the
flattened portion 55 and the anti-rotation portion 150 of the hole are facing.
Preferably, the shape of the first hole 101 and/or of the second hole 102, specifically
that or those interacting with the flattened portion 55, is irregular, that is to say not a
circular shape, so that the rotation of any axial symmetric element (bolt) is prevented
inside it.
The bolt 50 thus preferably has, at least in its portion suitable for interacting with the
frame 10, an irregular geometry, while the hole which it acts in conjunction with
preferably has a complementary shape thereto.
Such geometry of the components makes the bolt 50 insertable in the firearm 1 and in
the frame 10 in a unique position, wherein the bolt 50 is suitable to cross said first
hole or second hole 101 or 102 of an irregular geometry,
According to a preferred embodiment, the bolt further comprises a cavity 58, which
extends concentrically in relation to the transversal axis Y-Y, on the surface of the
bolt 50.
In particular, the cavity 58 has the specific purpose of permitting the rotation of the
bolt 50 around the transversal axis Y-Y in that it is placed in a predefined position
along said axis, so as to radially correspond with the first or second hole 101 or 102 of

an irregular geometry. In the embodiment with both holes having an irregular geometry, the bolt 50 comprises two cavities 58.
In other words, the bolt 50 is suitable to be placed in a predefined position along the transversal axis Y-Y, wherein the cavity 58 finds itself facing the first or second hole 101 or 102 and specifically the anti-rotation portion 150 thereof; thanks to the presence of the cavity 58 there is no engagement along the rotation axis between the bolt 50 and frame 10, the anti-rotation portion 150 is, in fact, suitable to place itself inside the cavity 58 so as to permit the rotation of the bolt 50 around the transversal axis Y-Y.
The cavity 58 thus has a width substantially equal or greater than the width of the wing of the frame 10 which it acts in conjunction with, so as to be able to house it when the rotation of the bolt takes place, preferably a width substantially equal to the width of the anti-rotation portion 150 which it acts in conjunction with. Preferably, therefore, when the frame 10 is housed in said cavity 58 the bolt 50 is prevented from translating along the transversal axis Y-Y; the bolt 50 is in fact blocked to the frame 10 in that this is housed in the cavity 58 between the lateral surfaces 581 within which it is defined. Said lateral surfaces 581 interact with the frame 10 obstructing or preventing the translation of the bolt 50 along the transversal axis Y-Y.
According to a preferred embodiment, the cavity 58 extends by a predefined arc of circumference, specifically suitable for permitting a maximum rotation of the bolt around the transversal axis Y-Y of 90°.
In other words, the cavity 58 comprises a limit stop surface 585, substantially perpendicular to the flattened portion 55, suitable to encounter in rotation the anti-rotation portion 150 to stop the rotation stroke of the bolt 50.
Preferably, the flattened portion 55 and/or the cavity 58 are positioned next to the translation portion 51.
According to the non-limiting example shown in the appended drawings, the frame comprises two wings 11 and 12; preferably the bolt 50 is thus suitable to cross both the wings through the first hole 101 and the second hole 102; the translation portion 51 is opposite the rotation portion 52; the translation portion 51 is preferably suitable

for being operated by means of pushing by the user.
In the locked position the bolt 50, in said embodiment, thus presents the translation
portion 51 projecting on one side of the firearm 1, while the rotation portion is "flush"
with the other side of the firearm 1; starting from said position, the bolt 50 is then
translated, and the rotation portion 52 projects from the side of the firearm 1.
Preferably, the bolt 50 is inserted in the firearm 1, first encountering the first wing 101
and subsequently the second wing 102 of the frame 10: preferably, the first hole 101 is
a circular shape while the second hole 102 has an irregular geometry to interact, as
illustrated with the flattened portion 55 and the cavity 58 positioned next to the
translation portion 51.
The dismantling and assembly steps of the firearm 1 will be illustrated below with
reference to the appended drawings. It will thus be clear how the structure and
different types of engagement of the various components described above entail
advantages in the dismantling of the firearm 1 and in its assembly.
Dismantling and assembly operations will be understood to mean the engagement and
disengagement of the slide 3 to/from the stock 2.
Starting from a position of a firearm ready to fire, wherein the slide 3 is positioned on
the stock 2 and the bolt 50 is in the locked position, reciprocally blocking the two
components.
In said locked position, the spring-holder 35 acts on the bolt 50, in particular, the
engagement end 350 is housed in the spring-holder seat 500 and the spring 30 is
loaded so as to keep the slide 3 in a forward position. The spring-holder seat 500 is
thus positioned in a position substantially perpendicular to the longitudinal axis X-X,
along the transversal axis Y-Y.
The user, by operating on the translation portion 51, moves the bolt 50 in translation,
the spring-holder 35 is kept in position along the longitudinal axis X-X by two
centring elements 22 comprised in the stock 2; this way the engagement end 350 come
out of the support surface 501 and begins to interact with the translation surface 502.
Due the inclination of the translation surface 502, the engagement end 350 may
translate along the longitudinal axis X-X moving in a longitudinal direction,
preferably perpendicular to the transversa] axis Y-Y.

In such translated position just described, the bolt 50 is thus positioned in such a manner that the cavity 58 finds itself radially facing the anti-rotation portion 150 of the frame 10.
The bolt 50 is thus now free to be rotated, that is to say the user, acting on the rotation portion 52 now accessible inasmuch as projecting as a result of the previous translation of the bolt 50, can rotate it along the length of the cavity 58, substantially by approximately 90°, for example until the anti-rotation portion 150 touches the limit stop surface 585.
Preferably, the barrel 31 comprises a dedicated recess 39; by rotating the bolt 50, this moves the engagement end 350 towards said recess 39, preferably upwards, until the engagement end 350 acts directly on said recess 39 and no longer on the bolt 50. In such position the bolt 50 thus presents the support surface 501 in a new position perpendicular to the previous, that is to say in a position substantially parallel to the plane which contains both the longitudinal axis X-X and the transversal axis Y-Y. Such position of the bolt 50 is thus the release position; the slide 3 and in particular the barrel 31 when moved, no longer find an obstacle and are thus free to be extracted in a forward direction and removed from the stock 2; in other words, the spring-holder seat 500 positioned upwards provides an area suitable to permit the passage during the extraction of the slide 3 and in particular of the barrel 31, for example permitting the passage of specific elements of the firing mechanism of the barrel 31: preferably, said elements of the firing mechanism comprise a disconnection tooth of the barrel 311. The firearm 1 is thus dismantled, stock 2 and slide 3 are reciprocally detached. As regards the assembly of the slide 3 to the stock 2 it is to be noted that before the assembly operations there is a preparation operation of the stock 2 in which the bolt 50 is inserted therein. The insertion operation of the bolt 50 is only performable if it is inserted so as to cross the hole with an irregular geometry in a specific insertion position. In said insertion position the bolt 50 is translatable along the transversal axis Y-Y into a predefined positioned in which the cavity 58 is radially aligned with the anti-rotation portion 150. The bolt 50 is thus rotatable, generally by 90°, until it is positioned in the release position. The bolt 50 is now positioned in the release position, wherein the support surface 501

extends substantially parallel to the pJane containing the longitudinal axis X-X and the
transversal axis Y-Y, in other words, the spring-holder seat 500 is positioned upwards.
With the bolt 50 in said position the slide 3, with the barrel 31 and the spring-holder
seat 35 is free to be moved along the longitudinal axis X-X, insertable on the stock 2.
The slide 3 comprises the spring-holder seat 35 and the barrel 31, and upon insertion
of the slide 3 along the longitudinal axis X-X, the spring-holder seat 35 encounters the
bolt 50; in particular, the engagement end 350 contacts the bolt 50 on the rotation
surface 503; the inclination of the rotation surface 503 makes the engagement end
350, loaded by the spring 30, apply a force to the bolt 50; such force applied on the
inclined plane places the bolt 50 in rotation around the transversal axis Y-Y.
The bolt 50 is thus now rotated and the engagement end 350, loaded by the spring 30,
comes into contact with the translation surface 502; the translation surface being
inclined, the force exercised by the engagement end 350 on it makes the bolt translate
along the transversal axis Y-Y; the bolt thus translates until the engagement end 350
finds itself housed in the support surface 501.
The bolt 50, in such position, is thus in the locked position. The spring-holder 35 acts
on the bolt 50 perpendicular to the spring-holder seat 500, the bolt 50 discharges said
forces entirely on the stock 2, blocking it to the slide 3 by means of the barrel 31.
In other words, the passage of the bolt 50 from the release position to the locked
position during the assembly steps is automatic and does not require the user to
perform any specific operation on the bolt 50.
Innovatively, the firearm which the present invention relates to is suitable to resolve
the drawbacks of the prior art, by presenting an innovative component structure
suitable for fulfilling the reciprocal locking requirements of the slide and stock but in
any case making the assembly and dismantling operations of the firearm easy and
safe.
Advantageously the bolt comprised in the firearm according to the present invention
has been designed in such a manner as to interact with the various components of the
firearm, among which the slide and stock in such a way as to make the dismantling
operations of the firearm easier for the user.
Advantageously the dismantling operations of the firearm comprise a series of steps in

a predefined, and irreversible, order which do not require of the user particular skills, as instead is the case in the dismantling of the firearms of the prior art. Specifically, in fact, during dismantling of the firearm the bolt can only be rotated after it has been translated; in addition it is not necessary to act on the slide and place it, and keep it, in a particular position for example rearward, to commence operations on the bolt; the first assembly operations are advantageously performed directly on the bolt 50 itself. In addition, advantageously, the efforts of the user the movements of the bolt are very modest in that the various operations are facilitated by the presence of inclined planes. According to a further advantageous aspect, the assembly operations are automated and do not require the performance of any operation on the bolt by the user, but merely the insertion of the slide on the stock.
According to a further advantageous aspect, the bolt is insertable, along the transversal axis, in the stock, in a unique position only, the insertion position; following the rotation of the bolt placed in the release position; the passage from the release position to the locked position is automated by the action of the engagement end, loaded by the spring, on various inclined planes which it acts in conjunction with. Advantageously in the reciprocal interactions of the stock and/or frame and bolt, thanks to the reciprocal shapes thereof, the rotation of the bolt is permitted only in a predefined position at a predefined angle. In the same way, the translation is also only permitted if the bolt is placed in a predefined position; advantageously, the bolt remains in the stock even when the slide is detached, in that by finding itself in the release position it is retained to the stock by means of the interaction between the cavity and the anti-rotation portion. An obvious effect achieved by such advantage is that of preventing the bolt from falling from the stock and possibly being lost, when the firearm is dismantled
According to a further advantageous aspect, further elements or components of the firearm are not necessary, but the components illustrated in this application are sufficient to permit or prevent the performance of the various operations: no anti-extraction o-rings are needed to block the bolt to the inside of the stock, as also no cavities or special grooves on the stock are needed to act as an end stop for example to the rotation of the bolt.

Advantageously the various components which interact with each other, specifically
the relative parts thereof, being inside the firearm, the aesthetics thereof benefit,
giving the designer more freedom, in that there no structural constraints to be
observed on the outside. In particular, the advantage is evident, thanks to the
automatic movement of the bolt, specifically in the last step of its assembly, of being
able to have , if wished, a lateral surface of the stock and of the firearm, near the
rotation portion, without projections which for example could give rise to unwanted
entangling.
According to a further advantageous aspect, the firearm which the present invention
relates to comprises a smaller number of components than the solutions typical of the
prior art giving rise to a simpler as well as more economical construction thereof.
A person skilled in the art may make variations to the embodiments of the firearm
described above or replace elements with others functionally equivalent so as to
satisfy specific requirements.
For example, in further embodiments, the frame has a different shape and structure
from that described and shown.
According to some embodiments, specific shapes of the stock of the firearm may go to
replace one or more of the components of the frame, for example the wings or holes
thereof.
Specifically, in fact, according to a further embodiment, without a frame 10 and/or
with a frame of a different shape to that described above, the bolt acts solely in
conjunction with the stock of the firearm. In such embodiment, the holes described
above by means of which the bolt is housed are made directly on the stock; holes
having the shapes and characteristics described above must thus be made on the stock,
so as to permit or prevent the specific movements of the bolt. In particular, in fact, in
the case in which the bolt does not interact with the frame, the aforesaid components,
such as the hole of an irregular geometry comprising an anti-rotation portion are
provided on the stock.
Each of said embodiments in no way varies the dismantling and assembly operations,
nor the stock preparation operations before such, according to the above description;
such operations in fact involve the same steps and have the same obstructions

entailing the same advantages as illustrated above .
Or again, in further embodiments, the spatial arrangement of the various components
is varied, so as to have, for example a bolt which does not project from both sides of
the firearm but from one side only.
Such variants are also contained within the scope of protection as defined by the
following claims.
Moreover, each of the variants described as belonging to a possible embodiment may
be realised independently of the other variants.

WE CLAIM:
1. Firearm (1) comprising:
- a stock (2);
- a slide (3) which extends along a longitudinal axis (X-X) and is suitable for
translating along it, wherein the slide (8) comprises a barrel (31), a spring-holder (35)
and a recoil spring (30), engaged on said spring-holder (35) so that in a configuration
of the firearm being ready to fire, it is suitable for keeping the slide (3) in a forward
position;
- a bolt (50) engageable with said stock (2), extending along a transversal axis (Y-Y),
transversal to the longitudinal axis (X-X), traversable and rotatable around said
transversal axis (Y-Y), wherein the bolt (50) is suitable for assuming a locking
position in which the slide (3) is locked to the stock (2), and a release position in
which the slide (3) is detachable from the stock (2), in which the bolt (50) comprises a
spring-holder seat (500) which, in the locked position, acts in conjunction with an
engagement end (350) of the spring-holder (35), wherein said spring-holder seat (500)
comprises:
i) a support surface (501) on which said
engagement end (350) engages in the locked position; and
ii) a translation surface (502) adjacent to the support surface (501) and inclined in
relation to it along the transversal axis (Y-Y), so as to permit the translation of the bolt
(50) acting in conjunction with the engagement end (350).
2. Firearm (1) according to claim 1, wherein the spring-holder seat (500) further
comprises:
iii) a rotation surface (503) adjacent to the support surface (501) and to the translation surface (502) and inclined in relation to it along the longitudinal axis (X-X), so as to permit the rotation of the bolt (50) acting in conjunction with the engagement end (350).
3. Firearm (1) according to any of the previous claims, wherein the bolt (50) extends along the transversal axis (Y-Y) so as to project at least on one of the sides of the firearm (1), preferably so as to project on both sides of the firearm (1).
4. Firearm (1) according to any of the previous claims, wherein the bolt (50)

comprises a translation portion (51) suitable for being actuated by the user to move the bolt (50) along the transversal axis (Y-Y), and a rotation portion (52) suitable for being actuated by the user to move the bolt (50) rotationally around the transversal axis (Y-Y).
5. Firearm (1) according to claim 4, wherein the rotation portion (52) extends
substantially radially in relation to the transversal axis (Y-Y).
6. Firearm (1) according to any of the claims 4 or 5, wherein the translation portion (51) is opposite the rotation portion (52).
7. Firearm (1) according to any of the previous claims, wherein in the passage from the locked to the release position the translation of the bolt (50) occurs before its rotation, and vice versa in the passage from the release to the locked position, the rotation of the bolt (50) occurs before its translation.
8. Firearm (1) according to any of the previous claims, wherein the bolt (50) has a flattened portion (55) along its extension and is inserted in the firearm (1) through a passage having an irregular geometry, for example not axial-symmetric, comprising an anti-rotation portion (150), suitable for interacting with said flattened portion (55) so as to prevent the rotation of the bolt (50) when it is placed in a predefined position along the transversal axis (Y-Y).
9. Firearm (1) according to claim 8, wherein the bolt (50) has a cavity (58) which extends concentrically on the surface of the bolt (50) starting from said flattened portion (55), so as to prevent the rotation of the bolt (50) when it is placed in a predefined position along the transversal axis (Y-Y), wherein said cavity (58) is radially at the anti-rotation portion (150).

10. Firearm (1) according to claim 9, wherein the cavity (58) extends by an arc of circumference suitable for permitting a maximum rotation of the bolt (50) of 90°, the cavity (58) comprising a limit stop surface (585), substantially perpendicular to the flattened portion (55).
11. Firearm (1) according to claim 9 or 10, wherein the housing of the anti-rotation portion (150) inside the cavity (58) prevents the translation of the bolt (50) along the transversal axis (Y-Y).
12. Firearm (1) according to any of the previous claims, further comprising a support

frame (10), supporting a firing mechanism (600) of the firearm (1), housed at least partially in the frame (2), extending along the longitudinal axis (X-X), in which the bolt (50) inserted transversally in the firearm (1) is suitable for crossing said frame (10).
13. Firearm (1) according to any of the previous claims, wherein the frame (10)
comprises at least one wing, a first wing (11) positioned substantially at the side of the
firearm (1), in which the bolt (50) crosses said first wing (11) through a first hole
(101).
14. Firearm (1) according to claim 13, wherein the support frame (10) has two wings, said first wing (11) and a second wing (12) positioned substantially at the side of the firearm (1) one opposite the other, wherein the bolt (50) crosses both said wings (11, 12), respectively through the first hole (101) and a second hole (102).
15. Firearm (1) according to the claims 13 or 14 and one of the claims from 8 to 12, wherein the first hole (101) and/or the second hole (102) has/have an irregular geometry, for example not axial symmetric, and comprises/comprise said anti-rotation portion (150).
16. Firearm (1) according to any of the previous claims, wherein the firearm (1) is a semi-automatic gun.