SIG SAUER Inc.'s P556 is a pistol version of the SIG556 rifle. The P556 semi-automatic pistol in 5.56 x 45mm NATO, has the same gas piston operating rod system and two position adjustable gas valve that make all SIG556 rifles reliable performers. The P556 pistol features an ergonomic pistol grip, rotating bolt, and is accepts standard AR15/M16 style magazines. Available in two styles, one uses an alloy quad-rail forearm for attaching lights, lasers, and other optics; while the second model utilizes a Swiss-type polymer hand guard for the clean retro look of the SG 550TM; the rifle that created the worldwide demand for precision Swiss arms. The P556 is outfitted with the SIG SAUER STS-081 Mini Red Dot Sight and is shipped in a Tactical Soft Case with one 30-round magazine.