16" Optic Ready M4 Upper

AR15 5.56 Upper Assembly. Features a 16", chromelined Remington M4 profile barrel with 1:7" twist, M4 Feed Ramps, Carbine-length direct impingment gas system with flat top front gas block with swivel and bayonet lug, USGI handguard, and Yankee Hill Machine Phantom 5 port flash hider. Upper receiver has dust cover and forward assist installed. Does not include bolt or charging handle.