Radical Firearms RF-15, Semi-Automatic, AR, 7.62x39mm, 16 Barrel, 1:10 Twist, 15 RPR MLOK Handguard, Anodized Finish, Black, Gray B5 Pistol Grip and B5 Stock, 1 Magazine, 10 Rounds FR16-7.62X39HBAR-15RPR-GRY The Radical Firearms 16 inch heavy profile 7.62x39 AR rifle uses MIL-STD Upper and lower receivers along with the 15 inch RPR free float rail system for increased accuracy, keeping your hands cool, and giving you plenty of room for accessories. Regardless of if it's your first or fiftieth, a Radical Firearms AR rifle will not disappoint!