Buy your Patriot Ordnance Factory upper's from BattleHawk Armory now! Prepare for the best with the P415 Edge complete gas piston upper. This complete upper comes with all you need to finish your rifle build you've been dreaming of. The upper comes with a nitride coated match grade barrel for superb accuracy and excellent corrosion resistance. Along with a great barrel the Gas piston system is adjustable to allow the shooter to tune their rifle for use with a specific ammunition or use with an NFA device. The upper makes use of the E2 enhanced Ejection system to remove the possibility of stuck cases. All of these features are put into solid shooting and dependable Upper from POF. Specifications- Patriot Ordnance Factory USA Item Number: 01309 AR15 Complete Upper Gas Piston System Adjustable Gas System 5.56 NATO also Accepts .223 Remington 16.5" Match grade Heat Treated Nitride Barrel 1:8 Barrel Twist Triple Port Muzzle Brake 1/2x28 Thread Pitch Enlarged Heat Sink Barrel Nut 14" M-Lok Rail E2 Enhanced Extraction Technology Mil-Spec Charging Handle Gas Piston Bolt Carrier Group Roller Cam Pin QD Sling Mounting Points Black