PSA 16" M4 Carbine-Length 5.56 NATO 1:7 Nitride 15" Lightweight M-Lok Freedom Rifle Kit - 5165450384

Barrel: 4150V Chrome moly steel, chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, nitride treated, and a carbine-length gas system. Barrel is finished off with a .750" diameter low-profile gas block, PSA 15" Lightweight M-Lok free float rail, and A2 flash hider.Upper: Forged 7075-T6 A3 AR upper is hard coat anodized black for durability. Featuring M4 feedramp cuts, these upper receivers are made for us right here in the USA.Bolt Carrier Group: For AR15 and M16 rifles and carbines. Bolt is made of 9310 ntirided steel. Gas key is secured with grade 8 fasteners and staked. Bolt carrier is also nitrided. Includes Charging Handle.Lower Build Kit: Includes the PSA Classic Freedom Lower Build Kit