BARREL OF AUTOMATIC SMALL ARMS, WHICH IS MADE USING COLD RADIAL REDUCTION METHOD, AND METHOD FOR ITS LOCAL HARDENING Russian patent published in 2013 - IPC F41A21/00 C21D1/00 C21D1/10 

FIELD: weapons and ammunition.

SUBSTANCE: barrel local hardening method consists in the fact that a barrel is installed in a device providing its vertical movement; a collar is oriented and aligned; cooling liquid is supplied to the barrel channel and a sprayer, heated without rotation above point A_C3 till the temperature of 880-900 °C, and then, it is cooled by abrupt movement of the heated zone under the inductor sprayer. Barrel (1) includes a channel with four grooves (2). In the breech end of the barrel there is a cartridge chamber with bullet inlet (3). On the breech part of the barrel there are two transverse cutouts for latch (4) of the barrel, as well as joves (5) for passage of the fame projection. On the breech face of the barrel there is annular projection (6) for supporting of a cartridge rim and cutout (7) for an extractor hook. On the chase there is flame arrestor (10). Barrel has finning (8) and four air supply channels. On the barrel there rigidly fixed is casing (12) with screen (13) and plate (14), gas chamber (15), gas regulator (16), ejector (17), shoe (18) muzzle-sight, and plain arm (19). On the outside of the barrel there is heat treated thrust shoulder (20) with two longitudinal slots (21).

EFFECT: elimination of barrel rolling.

2 cl, 13 dwg