Adams Arms P1 Upper 5.56 NATO / .223 Rem 16 Barrel

P1 Upper Features The Adams Arms P1 model is the perfect platform for shooters who enjoy building and customizing their rifle. The P1 model includes our Picatinny Railed Gas Block with 3 adjustable settings and M4 furniture. The P1 is your Piston Driven foundation ready to be customized to fit your needs. P1 Upper Specifications Caliber: 5.56x45mm NATO Model: P1 Barrel Length Range: 16 to 16.99 Sights: None Optic Ready Muzzle: A2 Flash Hider Firearm Fit: AR Platform Handguard Finish: Black Handguards: M4 Receiver Finish: Black Receiver Material: Aluminum Thread Pattern: 1 / 2-28 tpi Twist: 1:7 Weight: 4.10 lbs Barrel Description: 4150 Chrome Moly Vanadium Barrel Finish: Black Nitride Barrel Material: Steel Barrel Length: 16