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 new rifle and comes with a full length receiver rail, tri-rail forearm with covers, Sig STL-300J light/laser and vertical grip, collapsible and folding stock, flip up front and rear sights, one 30 round magazine, manual, lock, and a hard case. This rifle uses AR-15 magazines.