Patriot Ordnance Factory Minuteman 5.56mm NATO 16.5in Black Nitride Semi Automatic Modern Sporting Rifle - 10+1 Rounds - The Minuteman is POF's twist on what a direct impingement fighting carbine should be, topped with the controls and enhancements most important to remain mobile and light. Its E2 dual-extraction technology consists of four small channels cut into the walls of the chamber allowing a small amount of gas pressure to push against the neck of the spent case. The mil-spec aluminum anti-tilt buffer tube features carrier cradle extensions to ensure that the carrier is always supported by the buffer tube even when the bolt carrier is fully forward. This model features a magazine lock ;