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