Description As of March 2026, allow 5-10 days for this item to be built and shipped. Includes 6061 upper receiver (optional 7075 billet available and highly recommended), barrel, gas block, gas tube, and complete head-spaced bolt head. Does not include hand guard, bolt carrier assy, charging handle, or muzzle device. Barrel is installed and feed ramp is extended, blended and polished. Barrel nut included is simply to hold the assembly together and is thrown away after user installs their own hand guard. Nut may be Blemished. Also available with optional Superlative Arms Adjustable Gas Block. Barrels are available in 12.5″, 16.25″, and 18″ dimpled for gas block screw alignment. An adjustable gas block is recommended for Suppressed use. Light-Weight barrel profile is 790″ under the hand guards, .750″ at the gas block, and .730″ at the muzzle. 12.5″ Barrels have a carbine length gas system, 5/8-24 muzzle thread, 4150 steel, 1:20 twist. 1.20 pounds. Requires adjustable gas block for Super Sonic ammo and Suppressed use. 16″ Barrels have a carbine length gas system, 5/8-24 muzzle thread, 4150 steel, 1:24 twist. 1.52 pounds. 18″ Barrels have a mid-length gas system, 5/8-24 muzzle thread, 4150 steel, 1:24 twist. 1.70 pounds SB 704 applies to all California sales – Must ship to FFL.
