Diamondback DB15 6.5 Grendel 18in Matte Black Semi Automatic Modern Sporting Rifle - 28+1/5+1 Rounds - This Diamondback DB15 Rifle features a mid-length, medium 4150 chrome moly 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. It comes with one 28-round CPD mag and one 5-round CPD mag. This model has a Diamondback Black Gold lower receiver.