Buy your Patriot Ordnance Factory upper's from BattleHawk Armory today! a Black anodized finish a Dictator 9-position adjustable DI gas block with straight gas tube for reduced heat build up a NP3-coated Ultimate 1-pc BCG with an integrated gas key (no screws required) a Roller Cam Pin upgrade reduces friction & pre-mature wear within the upper receiver a E2 Dual Extraction Technology a Nitride heat-treated match-grade chrome-moly 16.5" barrel with triple-port muzzle brake a Oversized aluminum heat sink barrel nut a Tomahawk ambidextrous charging handle a MIL-SPEC flat-top upper a M-LOK(TM) free-floating 14.5" aluminum handguard rail with full-length Picatinny top rail & short bottom rail & QD sling mounts