 The trigger unit permits both single shots and automatic fire, selectable through a safety/fire mode selector lever situated at the left side of the pistol grip.The gun fires from an open bolt and the spring-loaded firing pin is operated by a projection on the bolt carrier, once the bolt is fully in battery and locked.Because of the overhead magazine, the sight line is offset to the left, and the front sight is mounted on a base which protrudes upward and to the left from the gas block.