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16" Barrel Length
5.56 NATO Chamber
1 in 7" twist
4150V Chrome Moly Steel Barrel, Nitride
Carbine-length Gas System
M16 Full Auto Bolt Carrier
C158 MPI/HPT Bolt
Barrel: 4150V Chrom Moly steel. Chambered in 5.56 NATO, with a 1/7 twist, M4 barrel extension, and a carbine-length gas system. This M4 profile barrel is finished off with a standard handguard in Flat Dark Earth, F-Marked gas sight base, and A2 flash hider.
Upper: Forged 7075-T6 A3 AR upper is machined to MIL-SPECS and hard coat anodized. These uppers are made for us right here in the USA by a mil-spec manufacturer.
Bolt: Full-auto profile bolt carrier group. Milspec Carpenter No. 158® steel bolt, Shot Peened, High pressure tested, Mag particle inspected, Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. 8620 steel M-16 profile carrier is chrome lined and phosphate coated.Browse for more PSA Uppers gun parts.