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 P-Series Low Profile Adjustable Piston System. This rifle features flip-up sights an A2 flash hider an ambidextrous safety selector & charging handle an Ergo pistol grip as well as a tactical SBA3 arm brace. 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: 12.5 - Barrel Contour: Government - Barrel Material: 4150 Chrome Moly Vanadium Steel - Muzzle Thread Pattern: 5/8-24 - Chrome Lined: No - Barrel Finish: QPQ Melonite / Black Nitride - Twist Rate: 1 in 10 - Chamber: .308 WIN - M4 Feed Ramps: Yes - Bolt Carrier: Full-Auto Rated 1-Piece w/Integral Piston Strike Face - Muzzle Device: A2 Flash Hider - Gas System Length: Mid Short Stroke Piston Operated - Gas Block Diameter: 0.750 - Handguard: Adams Arms AARS M-LOK Rail System - Sights: Defiance Flip-Up Sights - Grip: Ergo Grip - Trigger: Enhanced GI Trigger - Stock: SBA3 Pistol Brace - Weight: 6.9 lbs - OAL: 30 collapsed