The A3S rifle features a black powdercoat finish black polymer furniture 18 tapered barrel and polymer navy lower. The precision-welded top rail allows the addition of your favorite scope or you can use the traditional iron sights (included). - Specifications - OAL: 40.5 - Barrel: 18 - Weight: 9.5 lbs - Operating Systems: Roller-delayed blowback - Caliber: .308 (also accepts 7.62 x 51) - Action: SEMI-AUTOMATIC - Twist: 1/10 - Trigger Pull: 9-10 lbs - Magazine: 10