SELF-COCKING TRIGGER AND FIRING MECHANISM WITH SMALL EFFORT FOR FIRE ARMS Russian patent published in 2018 - IPC F41A19/00 

FIELD: instrument engineering.

SUBSTANCE: trigger and firing mechanism (TFM) contains an auto-fuse, a base sleeve, a hammer, a firing spring, a spring located on the hammer and counteracting the firing spring, and its adjusting bushing, a snap-spring, a hammer guide, trigger sear, inclined plane, flat spring, bushing, return springs of the slide, diagonal spring, manual semi-cocking lever, slide. TFM additionally includes micro-bearings, facilitating the descent and improving the smoothness of the trigger, manual semi-cocking lever and a plug which allow to semi-coke the weapon without slide manipulation. Spring, located on the hammer and counteracting the firing spring, reduces the force on the descent and performs the functions of the slide buffer, it is an additional return spring, softens the operation of the automatics of a pistol with cartridges of various capacities and provides a wide range of adjustment of the force on the descent and the return of the trigger on one weapon and on one TFM, and with the possibility of re-initiating a misfire cartridge by self-cocking or semi-cocking. Slide has a fixed part, on which it is possible to fix the optics and the muffler. Between the barrel and the slide there is no play.

EFFECT: flat spring allows minimizing the "failure" of the trigger and provides the possibility to use the function of preventing descent.

1 cl, 8 dwg