Rock River Arms LAR-BT3 X Series, Semi-automatic, AR, 308 Winchester/762NATO, 18 Fluted Stainless Steel Barrel, RRA Hunter Muzzle Brake, Anodized Finish, Black, Mid-Length Gas System, Hogue Rubber Grip, RRA 2-Stage Ultra Match Trigger, RRA Operator CAR Stock, RRA 17 Free Float M-LOK Handguard, 20 Rounds, 1 Magazine XBT31751B.V1 Rock River Arms X-Series X-1 Rifle is a billet set rifle with an 18" fluted cryogenically treated stainless steel in .308 winchester. Additionally, it features a RRA two stage ultra match varmint trigger, with a mid-length gas system, RRA 17" M-Lok compatible free float rail, a RRA Operator six position carbine stock and Hogue rubber pistol grip. This rifle is a 1 MOA rifle.