FEATURES: The Radical Firearms AR features a 16" stainless steel barrel with a medium contour and a 1:8" twist rate, chambered in 6.5 Grendel. The barrel is threaded with a 5/8x24 pitch and equipped with a rifle-length gas system and a .750 low profile gas block. It includes a BMD muzzle device and a 15" M-Lok thin rail free float handguard for keeping your hands cool, and optimal accessory mounting. The rifle is fitted with a MIL-STD charging handle and fire control group and comes with a 6-position adjustable B5 BRAVO stock. DETAILS: Brand: Radical Firearms Barrel Length:18"