The M5 (.308) lower parts kit has all of the parts that you need to build a custom .308 AR except the Fire Control Group components (Trigger, Disconnector, Hammer and related springs) and a grip. This kit gives you all of the other parts if you prefer other FCG and grip components. Mil-spec dimensions and coating ensure the highest quality and correct component interface. The custom takedown pins work with the M5 Lower Receiver. The