AVILABLE AND IN STOCK FOR IMEDIATE DELIVERY!!! This Sig Sauer 556 is a semi-auto rifle that shoots the 5.56mm or.223 round. It has a 16" barrel and has a black finish. This is a used rifle and comes with a full length receiver rail, tri rail fore arm, flip up sights, collapsible stock with storage, rubber butt pad, one 30 round magazine, and a hard case. This rifle uses AR-15 magazines.