The REVOLUTION uses a 5.56 bolt carrier and other 5.56 parts allowing for a shorter overall receiver size and reduced weight. This also isn't a normal small frame .308 it's smaller! It 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. Weighing in at 7.3 lbs. The Revolution features our new Edge Handguard with four built-in QD mounts and is packed with all you've come to expect from POF-USA. Fully ambidextrous billet receiver set nickel plated bolt carrier 5-position adjustable gas piston single stage match grade trigger and more. - SPECS - OAL (Collapsed) 34 in (16 308 Model) - Weight 6.8 lbs - Rifling 1:10 - Barrel 16.5 in - Trigger Match Grade Drop In - Furniture Mission First Tactical - Receiver Finish Black Anodized - Handguard 14.5 MMR - Muzzle 3 Port Break - Standard Features - Nitride Heat Treated Fluted Barrel - 5 Position Adjustable Gas Block - Piston Driven Action - GEN4 Lower Receiver - (1) 20rd Magazine