San Tan Tactical STT-15, Semi-automatic Rifle, AR-15, 556NATO, 16 Threaded Barrel, Cerakote Finish, Multicam Black, 30 Rounds, 1 Magazine STT15-R-556-16-MCB San Tan Tactical's STT15 5.56 AR15 Rifle is built with true matched, hand finished pillar billet sets. The STT15 lower is fully ambidextrous and has three QD attachment points.