Abstract: A multi-mode and/or multi-ammunition type weapon is described, whereupon being removed from a stored position is always initially in a default mode that fires one form of ammunition type, and can be quickly placed by a user into a different mode that fires a second, and different, form of ammunition type. When returned to the stored position, an integral ammunition type selector is automatically placed into an initial position enabling the weapon to fire one of the multiple ammunition types as selected by an integral ammunition sequence selector. The ammunition sequence selector enables selection of either the first or second form of ammunition type as the default ammunition type when the weapon is placed into the stored position. A shot sequence recorder is optionally included for recording sequences of ammunition types fired, providing an un-alterable record of firing events.

Abstract: The inventive technology is directed to a bolt hold-open system configured to lock the bolt of an AK-47 firearm, or variants of the AK-47, in an open position after the last cartridge in a magazine has been ejected.

Abstract: A locking mechanism for a firearm including a frame, a slide, a barrel and a firing mechanism is disclosed. The locking mechanism includes a body to engage the barrel and a slide lock extending from the body to engage the slide. With the slide in a forward position, the slide lock extends at least partially through an ejection port of the slide to engage the barrel with the slide.

Abstract: A bolt assembly for a machine gun according to an exemplary aspect of the present disclosure includes, among other things, a lock interface insert configured to be insertable into a bolt. The lock interface insert includes a main body defining a first engagement surface and a second engagement surface. At least one of the first and second engagement surfaces is configured to selectively engage a portion of a breech lock.

Abstract: Breech guides for use with breech assemblies and firearms including such breech guides are disclosed. An example breech guide for use with a breech assembly of a firearm includes a support element positioned within the breech assembly and a control element on the support element, the control element is adapted to control a cartridge-feeder mechanism of the firearm. The example breech guide includes a guide element on the support element. The guide element is adapted to guide the breech assembly relative to guide rails of the firearm. The support element extends along an axis of symmetry substantially perpendicular to a bore axis. The control element and the guide element being substantially coaxially positioned relative to the axis of symmetry.

Abstract: A firearm with an improved breech bolt assembly comprises a barrel (12), a breech bolt assembly (18, 21), a body (14) equipped on opposite sides with ports (15) for the ejection of a cartridge case, in addition to a magazine (17), wherein the breech bolt assembly, which is moveable with respect to the body (14) comprises a breech bolt-holder slide (21), a breech bolt (18) equipped with a rotating locking head (25), cam guide rails (26, 27) of the relative movement between the breech bolt (18) and slide (21), and also stopping means (28, 29) of the relative movement comprising a control pin (28) which can be moved vertically with respect to a first control seat (29), charged by a recoil spring (30) applied between the slide (21) and the pin (28), said pin (28) having a cocking handle (23), or reloading lever, rotatingly applied thereto, for the manual moving of the breech bolt assembly (10).

Abstract: An ammunition indexing mechanism for moving, responsive to actuation of a trigger mechanism, a cartridge from a selected one of a pair of opposed feedports in a weapon receiver and into alignment with a firing chamber of a barrel assembly of the weapon, has a rotary mechanism for moving through a selected index angle each ammunition cartridge entering through the selected feedport; and a torque assembly for storing energy, responsive to a selected movement of the barrel assembly, until released to operate the rotary mechanism to move, for each selected barrel assembly movement, each sequential cartridge through similar angular displacement to a position aligned with the firing chamber.

Abstract: A novel mechanism for moving a gun bolt toward and away from a firing chamber of a barrel assembly having movement relative to a receiver in a cartridge-firing weapon, having a camming channel formed in the receiver of the weapon, uses a rack member having an end coupled to the gun bolt and moving substantially linearly with the gun bolt toward and away from the chamber. A gear train has a housing affixed to the moving barrel assembly; an input member moves in the camming channel responsive to barrel assembly movement, to cause an output member to move the rack member and attached gun bolt toward and away from the chamber with substantially-linear displacement, velocity and acceleration greater than the associated displacement, velocity and acceleration of the moving barrel assembly with respect to the weapon receiver.

Abstract: Elements for decelerating the recoil of the moving parts of a fire arm of the type with a casing (12) having mobile moving parts (3) bearing a mobile barrel (4) and a striker (13), whereby the drive element of said striker (13) consists of a kinematic chain (15) containing a trigger (16) revolving in the casing (12), characterized in that between the moving parts (3) and the barrel (4) a lever (1) hinged in the casing (12) is activated, whereby this lever (1) has a stop (6) towards the front making contact with a surface (5) of the moving parts (3) during only part of the recoil of said moving parts (3) whereby this recoil causes the lever (1) to revolve until it no longer makes contact with the surface (5), whereby this lever (1) also has a stop (9) towards the end making contact with a surface (8) of the barrel (4), such that during said revolving motion, the barrel (4) follows the recoil of the moving parts (3), but at a lower speed with regard to the lever L2/L1.

Abstract: A heavy support weapon, for example, of 30 mm caliber, designed for firing from conventional machine gun mounts without undue recoil loads transferred to the gun mount. The weapon is designed for first round accuracy whether in the automatic open bolt or semi-automatic closed bolt mode. The weapon 10 includes a barrel 13 joined to a barrel yoke 21 in a receiver 14 aft of a front housing assembly 15. The recoil system includes a main recoil spring 30, a secondary spring 23, a buffer group including rods 60, springs 61 and plate 63. A slide bolt assembly 40 includes a slide 41, a bolt 42, a face 43, bolt face levers 44 and actuating pins 45, all within the receiver 14. The bolt face 43 is driven vertically by the bolt face levers 44 to receive a new round, load it and remove and discharge a spent casing. The slide bolt assembly 40 travels forward and aft during the firing cycle.

Abstract: A semi-automatic rifle including a recoiling barrel adapted to carry rearward the elongated bolt carrier containing the bolt for compressing the recoil spring, and a self-unlocking device including a self-unlocking rod longitudinally slidably mounted on the bolt carrier normally engaging the rear face of the barrel in a battery position and a trigger actuating device for thrusting the self-unlocking rod forward during the early stage of recoil for separation of the bolt carrier from the barrel before the barrel reaches the end of its recoil movement.

Abstract: An automatic firearm having a bolt which recoils upon each shot and an additional mass mounted for sliding parallel to the bolt and fastened to the bolt by an amplifying lever which is pivotally mounted on the bolt by a transverse pin and which has a resting surface adapted to come into contact with a stop surface which is stationary at the start of the recoil of the bolt. The amplifying lever is H-shaped. The cross bar of the H constitutes the transverse axis of pivoting of the assembly of the lever and the two vertical uprights constitute two symmetrical unit amplifying levers operating in parallel each capable of assuring a proper fastening together of the bolt and the additional mass. The assembly of the amplifying lever has complete symmetry with respect to the central plane perpendicular to its axis of pivot and lends itself to continuation of the firing in case of the breaking of one of the unit amplifying levers.

Abstract: An automatic firearm has a recoiling bolt connected by an amplifying lever to an additional mass subjected to the action of a recoil spring. One arm of the lever, via a push member, holds in a position of rest a stop pawl which is capable, when it is in active position, of retaining a striking hammer in striking position. The breaking of the lever permits the movement into the active position.