This Sig Sauer 556 SWAT is a semi-auto rifle which fires the .223 round. It has a black finish and a 16" barrel. This brand new rifle has a full length receiver rail, a quad rail forearm system, a Sig STL-100 vertical grip with light, a side-folding, collapsible stock, and flip up front and rear sights. It comes with rail covers, one 30 round magazine, and a hardcase. This rifle uses AR-15 magazines.