M1919A4重机枪原本是专为步兵设计的气冷式重机枪,安装在三脚架上使用,无肩托。因其较笨重,1950年代逐步被M60通用机枪取代。图中的M1919A4双联机枪出自美国民间枪械爱好者之手。两挺机枪并联装在枪架上,但两支枪的击发机构并不联动,仍采用各自的击发机构。枪架中间安装有环形瞄具。枪架后方设有肩托,但其作用并不是抵肩射击,而是通过操作肩托带动枪架转动,以实现射击方向的调整。 M1919A4 heavy machine gun was originally designed for infantry air-cooled heavy machine gun, mounted on a tripod to use, no shoulder rest. Because of its heavier weight, the 1950s was gradually replaced by the M60 general purpose machine gun. The M1919A4 twin machine guns in the picture are from the hands of American folk gun enthusiasts. Two machine guns mounted in parallel on the gun rack, but the two guns firing mechanism does not move, still using their own firing mechanism. The middle of the gun rack mounted ring sight. Shoulder support behind the gun frame, but its role is not shoulder to shoulder shooting, but by operating shoulder support gun rack rotation, in order to achieve the shooting direction adjustment.