The Adams Arms P3 is the performance match-grade model in the P-Series lineup. The P3 features a jet comp ambidextrous charging handle low mass carrier an ergonomic free float rail and our signature P-Series Micro Block piston system. This upper is manufactured and ready to compete with any other long range precision AR on the market. - Upper Receiver: A4 Flat-Top Forged - Barrel Length: 16.5 - Barrel Contour: Competition - 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 8 - Chamber: 5.56x45mm NATO - M4 Feed Ramps: Yes - Bolt Carrier: Low Mass Full-Auto Rated 1-Piece w/Integral Piston Strike Face - Muzzle Device: Jet Comp - Gas System Length: Rifle Short Stroke Piston Operated - Gas Block Diameter: 0.750 - Handguard: Adams Arms M-LOK Rail System - Sights: None - Weight: 4.82 lbs