Sig Sauer AR-10 716 I Tread, features an M1913 Mil-STD rail, free-floating 1-10 twist rate carbon steel barrel @ 16" in length, 20+1 round magazine, a 6 position Mag-Pull SL-K stock, a single stage polished - hard coat trigger, an M-Lok rail, ambi controls to accommodate both right and left-hand shooters, and a 3 prong flash hider.