An automatic submachine gun for exploiting recoil, comprising:
- a stock (2);
- a fixed barrel (4);
- a grip (3) provided with an extractable butt (20);
- a bolt (6) configured to slide in a direction parallel to a longitudinal axis of the barrel (4), inside the stock (2), to lock a breech of the barrel (4);
- a device for recovering recoil kinetic energy of the bolt (6);
- a hammer (22) configured to swing in opposition to, and through action of, a spring actuator element (23), the hammer configured to swing between a cocked position and an uncocked position;
- a trigger assembly for the hammer (22) comprising:
- in turn a swinging trigger (21) pivoted on the stock (2) and operatively connected to a sear lever (26);
- a first opposing lever (28) of the hammer (22) for single shot fire actuatable by the sear lever (26);
- and a second opposing lever (29) of the hammer (22) for continuous burst fire actuatable by the sear lever (26);
- a manual fire mode selector (34) connected to a rotating shaft (35) having a cam (36) configured to interact with said first opposing lever (28) of the hammer for single shot fire and with said second opposing lever (29) of the hammer for burst fire;
- an extractable magazine (8) for loading cartridge ammunition into a cartridge chamber (210) of the barrel (4);
- and
- a firing pin (37) actuatable by the hammer (22) and configured to slide in a direction parallel to the longitudinal axis of the barrel (4) in a seat provided in the bolt (6);
- where the hammer (22) is configured and disposed to interact with the bolt (6) to absorb a significant fraction of the recoil kinetic energy of the bolt (6) for attainment of the cocked position;
- where the hammer (22) has a point of impact (201) with the bolt (6), where a centre of mass (G) of the hammer (22) is positioned below the point of impact (201) of the hammer (22) with the bolt (6), and where, upon interaction of the hammer (22) with the bolt (6), a length of movement of the centre of mass (G) of the hammer (22) is amplified relative to a length of movement of the bolt (6);
- and
- where the gun is blowback operated, and where the breech of the barrel is not locked mechanically at time of firing.