16″ 5.56 M4 Carbine FSB Rifle Kit Features Barrel: Chrome Moly steel barrel chambered in 5.56 NATO with a 1:7 twist rate, M4 barrel extension, and a carbine-length gas system. This phosphate M4 barrel is finished off with a standard handguard, 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, features a forged upper receiver. These uppers are made for us right here in the USA by oue own manufacturer. Bolt: Full-auto profile bolt carrier group. Milspec Carpenter No. 158® steel bolt. Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. Lower Build Kit: Includes Classic M4-Style Stock, A2 Pistol grip, Classic Lower Parts Kit and Mil-Spec diameter 6-position buffer tube assembly. Everything you need to finish your stripped lower. Specs Barrel Length: 16″ Gas System: Carbine-Length Barrel Profile: M4 Barrel Steel: 4150V Chrome Moly Vanadium Barrel Finish: Phosphate Muzzle Thread: 1/2-28 Chamber: 5.56 NATO Twist Rate: 1/7″ Barrel Extension: M4 Diameter at Gas Block: .750″ Gas Block Type: F-Marked Front Sight Base Muzzle Device: A2 Flash Hider Receiver Material: Forged 7075 T6 Aluminum Receiver Type: M4 Handguard Type: DPMS Retro Carbine Handguards, Black Stock: DPMS Retro M4 Adjustable Stock, Black Grip: DPMS Retro A2 Grip, Black Fire Control Group: DPMS Mil-Spec Fire Control Group Bolt Carrier Group Included: Yes Bolt Steel: Carpenter 158 Bolt Carrier Profile: Full-Auto Charging Handle Included: Yes Overall Length: 24.5″
