AR15 | 4.5" Upper Receiver | 5.56

This AR-15 Complete 5.56 Side Charging pistol upper has a 4.5" M4 barrel with a parkerized finish, and features a 1:7 twist, with a micro length gas system with a .875 gas block. It includes a 4" MLOK rail, a M4 flat-top 7075 billet aluminum upper receiver, a Bolt Carrier Group, Flash Hider, and a right-side charging (Gen2) handle (patent protected). This 5.56 upper is compatible with any mil-spec AR-15 lower.