Diamondback DB10 308 Winchester 18in Blued/Black Semi Automatic Modern Sporting Rifle - 20+1 Rounds - This Diamondback DB10 Rifle features a mid-length, medium 416 stainless steel fluted barrel, mid-length gas system and a shot-peened Mil-Spec 8620 bolt carrier. It utilizes 7075-T6 aluminum receivers, 15in M-Lok handguard, Magpul MOE-K2 grip, and a Magpul CTR stock. This model has a Diamondback Black Gold lower receiver.