The Adams Arms P2 model is the tactical battle-ready model in the P-Series lineup. The P2 model includes an ergonomic free float rail that covers the all new P-Series Micro Block piston system. This upper features a Manimal flash hider and ambidextrous charging handle. The P2 is your off-the-shelf tactical model that is configurable for any type of shooter. - Upper Receiver: A4 Flat-Top Forged - Barrel Length: 11.5 - Barrel Contour: Government - Barrel Material: 4150 Chrome Moly Vanadium Steel - Muzzle Thread Pattern: 1/2-28 - Chrome Lined: No - Barrel Finish: QPQ Melonite / Black Nitride - Twist Rate: 1 in 7 - Chamber: 5.56x45mm NATO - M4 Feed Ramps: Yes - Bolt Carrier: Full-Auto Rated 1-Piece w/Integral Piston Strike Face - Muzzle Device: Manimal Extended A2 Flash Hider - Gas System Length: Carbine Short Stroke Piston Operated - Gas Block Diameter: 0.750 - Handguard: Adams Arms M-LOK Rail System - Sights: None - Weight: 3.76 lbs