PSA upper receiver with a 16 inch mid-length nitride barrel chambered in 5.56 NATO with 1:7 twist, M4 feed ramps, mid-length gas, and a .750" low-profile gas block. It features a PSA 13.5" Hex Full Picatinny M-LOK free float rail. Forged 7075-T6 A3 upper, hard coat anodized black for durability. Upper is made in the USA. Not included: bolt carrier group (BCG) or charging handle (CH).