The Super Duty Rifle features the latest in weapon technology available exclusively from Geissele Automatics. This 16" rifle chambered in 5.56mm features a Nanoweapon coated Surefire Closed-Tine Warcomp mounted to an in-house 16" Mag Phosphated Cold Hammer Forge, Chrome Lined, 1-7 twist Geissele barrel. Geissele barrels are precision machined and cold hammer forged utilizing the highest quality materials at a state of the art facility in North Wales, PA. The Geissele Length gas system and Geissele Super Compact Gas Block (with bomb-proof installation) ensures reliability and optimal performance in extreme conditions and heavy use.