The Sig 556 features the same high performance two position adjustable gas
piston operating rod system engineered by Sigs sister company Swiss Arms
and marries it to a trigger housing that not only cuts the rifles weight by
a pound but is designed to accept standard AR magazines. The Picatinny rail
equipped receiver is made of high strength carbon steel with a durable wear
resistant Nitron X rifle finish. The rifle comes equipped with a smooth two
stage trigger. A 30 round magazine is supplied with each rifle.
Mfg Item Num: R55616BCSRD
Caliber :223 Remington/5.56 NATO
Barrel Length :17"
Trigger :Two Stage
Weight :8.3 lbs