Patriot Ordinance Factory REVOLUTION Cal: 7.62 NATO/.308win Barrel: 16.5" (1:10) Handguard: 14.5" Mlok-RAIL Weight: 7.3lbs This isn’t a "normal" small frame .308, it’s smaller! 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. This makes the REVOLTION your best friend when sourcing new parts or upgrades, that means no more troubles with buying expensive proprietary parts.