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 pistol features flip-up sights an A2 flash hider an ambidextrous safety selector & charging handle an Ergo pistol grip as well as an SBA3 tactical 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: 7.5 - Barrel Contour: Heavy - 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: A2 Flash Hider - Gas System Length: Pistol 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: 5.5 lbs - OAL: 23.5