The Diamondback DB15 features a 7" Chrome Moly Vanadium barrel with an A2 flash hider; pistol-length, Direct Impingement gas system; shot-peened, magnetic particle inspected Mil-Spec 8620 carrier; 6" M-LOK handguard; SB tactical SBA3 brace; Magpul MOE grip and aluminum receivers. Includes 30rd Magpul Gen M2 PMAG. Model Carbon Action semi-auto Casing OD Green Finish OD Green Safety Yes Caliber 5.56 NATO Capacity 30 Barrel Type 4140 Chrome-Moly Vanadium Barrel Length 7"