SIG 556 No other semi-automatic rifle has captured the imagination of the shooting public like the SG 550 series rifle. For years this legendary Swiss made rifle has been restricted to law enforcement and military sales where it has continuously built on its reputation for outstanding performance, accuracy and durability. SIG SAUER® offers the U.S. produced version as the SIG 556, which is available to the general consumer and law enforcement markets. The SIG 556 features the same high-performance two position adjustable gas piston operating rod system engineered by SIG’s sister company Swiss Arms and marries it to a trigger housing that not only cuts the rifle’s weight by a pound but is designed to accept standard AR magazines.

SIG 556 The SIG 556 features a 16 inch military grade cold hammer forged barrel, chambered in 5.56mm NATO, with a twist rate of 1 in 7 inch. The flash suppressor uses a standard .5 x 28 TPI thread pattern, ensuring compatibility with after-market accessories. The forearm housing the gas operating system is a vented non-slip polymer featuring the SIG TriRail design with three integrated Picatinny rails for mounting accessories. The optional flip up front combat sight is adjustable for windage and elevation. The Picatinny rail equipped receiver is made of high strength carbon steel with a durable wear-resistant Nitron® X rifle finish. The Picatinny rail features an optional flip up rear sight that works in concert with the optional front combat sight, providing iron sight performance and a back up sight option for optics. Select versions feature a Red Dot style holographic sight. This sighting system provides quick target acquisition and features 4 different illuminated reticle patterns with adjustable intensity. The trigger housing is machined from an aircraft grade aluminum alloy forging with a hard-coat anodized finish designed to survive extreme conditions. The rifle comes equipped with a smooth two-stage trigger, ambidextrous safety and is designed to accept standard AR magazines. A 30-round magazine is supplied with each rifle. The collapsible buttstock features a rubber butt pad, multiple sling attachment points, and a waterproof battery compartment. The ergonomically designed pistol grip features an integrated storage compartment.

Model 556 
Action Semi-automatic
Caliber 5.56 NATO & 223 Rem 
Barrel Length 16 inch
Finish/Color Blue 
Grips/Stock Black Collapsible Stock 
Accessories 1 Mag 
Capacity 30Rd 
Description Tri-Rail Forend