This rifle features a Gen 4 precision machined billet upper receiver with extended feed ramp and anti-rotation interface with the handguard. Additonal features include a 13.7″ Infidel barrel with a pinned and welded KX3 muzzle device to bring it to a legal 16″ length, ambidextrous selector and bolt catch, ambidextrous charging handle, 15″ NSR M-LOK rail, Magpul MBUS Pro sights and a Magpul SL buttstock assembly.