Patriot Ordnance Factory Revolution GEN4 Piston Driven 6.5 Creedmoor 16in Bronze/Black Anodized Semi Automatic Modern Sporting Rifle - 20+1 Rounds - POF worked Patriot magic into the Revolution by using a 5.56 bolt carrier and other 5.56 parts allowing for a shorter overall receiver size and reduced weight. 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. With their redesigned triple port muzzle brake recoil management is not an issue. You may have just found your "one gun". New Edge Handguard With 4 Built-In QD Mounts Fully Ambidextrous Billet Receiver Set Black Nitride Bolt Carrier Group 5-Position Adjustable Gas Piston Single Stage Match Grade Trigger