PSA 16" M4 Phosphate 5.56 NATO 1/7 13.5" Lightweight Hex M-LOK Upper - With BCG & CH

Barrel: The 16" 4150V Chrome Moly Vanadium steel Phosphate barrel is chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a Carbine length gas system. The barrel is finished with a .750" diameter low-profile gas block, PSA 13.5" Hex Full Picatinny M-LOK Free Float Rail and an A2 flash hider.Upper: Forged 7075-T6 A3 AR upper is hard coat anodized black for durability. Featuring M4 feed ramp cuts, these upper receivers are made for us right here in the USA.Bolt Carrier Group: For AR15 and M16 rifles and carbines. The bolt is made of shot-peened, Mil-spec Carpenter 158A(R) steel. The gas key is secured with grade 8 fasteners and staked. The Bolt carrier is 8620 steel. Includes Charging Handle.