AUTOMATIC SMALL ARMS Russian patent published in 1998 - IPC

FIELD: armament. SUBSTANCE: automatic small arms has a receiver with a breech- block and return spring. Trigger mechanism in it uses a sear installed on a bolt in the receiver, the sear has a bearing surface reverse to the bearing surface on the breechblock sear notch. The sear bearing surface is shifted relative to the sear bolt. The sear is made in the form of a rocker, with the sear stop fastened to its front arm; the sear stop is made is made in the form of a double-arm lever. One arm of the sear stop is made in the form of a cam and installed for engagement with the recoiling breechblock, and the end of the other arm has a bearing surface resting on the mating bearing surface made in the receiver before the opening, shifted towards rotation of the sear stop under the action of the trigger. The sear stop spring is located in a seat made in the sear. A bulge is made on the other arm of the sear for engagement with the breechblock in the rear position, the bulge consists of sections inclined and parallel to the breechblock longitudinal axis. The inclined section is made at an angle of 30 to 60 deg. to the breechblock longitudinal section. EFFECT: simplified design and enhanced reliability. 2 cl, 3 dwg