PSA 20" Rifle Length 1/7 Nitride 15" Lightweight M-lok Upper – With BCG & CH

Barrel: 20" Chrome-moly barrel steel chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a rifle-length gas system. The barrel is finished with nitride finish for durability. Barrel is finished off with an .750" diameter low-profile gas block, PSA 15" Lightweight 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 may have T-marks, 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, and the gas key is secured with grade 8 fasteners and staked. The bolt carrier is made from 8620 Steel.