Patriot Ordnance Factory Revolution Burnt 308 Winchester 16.5in Bronze Cerakote Semi Automatic Modern Sporting Rifle - 20+1 Rounds - The Revolution features many 5.56 parts, such as charging handle, bolt carrier, cam pin, buffer, heat sink barrel nut, handguard, and 5-position gas piston operating system. The barrel extension, bolt assembly, upper, and lower receiver are the exact same size as those on an AR15. The new Edge Handguard has four built-in QD mounts, and is packed with all you've come to expect from POF-USA. Fully ambidextrous billet receiver set, high phosphate nickel coated bolt carrier group, 5-position adjustable gas piston, single stage match grade trigger, and more. With our redesigned triple port muzzle brake recoil management is not an issue. Burnt bronze finish on this model gives the gun a more tactical aesthetic and added protection. Charging handle; Bolt carrier; Buffer; Heat sink barrel nut;