Abstract: A firearm comprises a frame; a barrel; a hand grip; a breechblock slidable along the frame; a striker slidable in the breechblock; a longitudinal elastic device for the recovery of the recoil kinetic energy for rearming the striker; and a closing block for locking the breechblock in the closing position, the closing block having a body which extends longitudinally and having a rear wall engaged with a downward protrusion integral with the barrel, a front wall engageable with the breechblock and a longitudinal recess which opens at the front wall, where the longitudinal elastic device for the recovery of kinetic energy has a longitudinal rear portion housed in the recess and a longitudinal front portion retractable towards the inside of the recess, and is longitudinally interposed between a front stop abutment solidly constrained to the breechblock and a rear stop abutment solidly constrained to the frame.

Abstract: A firearm, particularly a gun operating by recoil exploitation, comprising: a frame; a barrel, a hand grip; a breechblock slidable for the closing of the breech of the barrel; a striker; a longitudinal elastic device for the recovery of the recoil kinetic energy of the breechblock for rearming the striker; a release lever having a coupling position and a release position of the striker; a single action trigger mechanism comprising a trigger and a trigger transmission rod operatively connected to the trigger and to the release lever, and an antagonist lever to the release lever, the mass of the antagonist lever being distributed and arranged to strain the antagonist lever with inertial forces that contrast the release lever for preventing the accidental release of the striker.

Abstract: An automatic submachine gun for exploiting recoil, that includes a stock; a fixed barrel; a grip provided with an extractable butt; a bolt sliding in direction parallel to the longitudinal axis of the barrel inside the stock for locking the breech of the barrel; a device for recovering the recoil kinetic energy of the bolt; a hammer swinging in opposition and through the action of a spring actuator element between a cocked position and an uncocked position; a trigger assembly for the hammer; an opposing lever of the hammer for single shot fire; and an opposing lever of the hammer for continuous burst fire; a manual fire mode selector; an extractable magazine for loading cartridge ammunition; and a firing pin.

Abstract: An automatic submachine gun for exploiting recoil, that includes a stock; a fixed barrel; a grip provided with an extractable butt; a bolt sliding in direction parallel to the longitudinal axis of the barrel inside the stock for locking the breech of the barrel; a device for recovering the recoil kinetic energy of the bolt; a hammer swinging in opposition and through the action of a spring actuator element between a cocked position and an uncocked position; a trigger assembly for the hammer; an opposing lever of the hammer for single shot fire; and an opposing lever of the hammer for continuous burst fire; a manual fire mode selector; an extractable magazine for loading cartridge ammunition; and a firing pin.

Abstract: A shell for bullets of automatic or semiautomatic firearms with inertial closure, comprising a hollow cylindrical body which is closed, at one of its axial ends, by a head and is adapted to accommodate a bullet at the opposite axial end, the head being centrally provided with a cap that accommodates the primer. At least the portion of the shell which is extracted from the firing chamber when the fired bullet leaves the barrel is provided with reinforcement means to prevent accidental bursting of the shell at the end of the firing action and when the extraction of the shell from the firing chamber begins.