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One Kit to Complete your AR-15 Build The FM Products AR-15 Pistol Build Kit has all components needed to build out a new setup. Select a standard AR-15 Stripped Lower Receiver and this Build Kit will provide a high quality setup at a great price. The monolithic style upper features smooth contours, that integrate smoothly with the MLOK handguard. The handguard has plenty of real estate for accessory attachment. The quality 41V50 barrel, machined by FM Products using their proprietary methods ensures high performance and precision for thousands of rounds. The bolt carrier group and barrel are nitride finish to resist corrosion and to ease cleaning. The included MFT Grip & Brace make the final pistol configuration comfortable to shoot. The in-house produced lower parts kit ensures you get reliable components to complete any standard AR-15 lower. Proprietary Interlocking Gas Block & Barrel ensure 100% alignment Premium 12” Barrel is machine from 41V50 Steel Lightweight Barrel has a Nitride Finish & Carbine Length Gas System Chambered in 223 Wylde with a 1-8 Twist A2 Flash Hider on ½-28 Muzzle Threads Barrel & Upper Receiver Feature M4 Feedramps 10.5"" M-LOK Monolithic-style Handguard Slim & lightweight Monolithic style upper M16 Bolt Carrier Group with Nitride Finish 9310 Steel Bolt is Magnetic Particle Inspected Premium LPK machined by FM Products 7075 T6 Carbine length receiver extension MFT grip and brace Mil-spec 7075 Charging Handle