Adams Arms AR-15 P2 Adjustable Gas Piston Pistol Upper Receiver Assembly 5.56x45mm NATO 11.5'' Barrel

This Adams Arms P2 Adjustable Gas Piston Upper Assembly is chambered in 5.56x45mm NATO and comes ready to fire right out of the box after installation onto any standard AR-15 pistol or registered SBR lower receiver.  The P2 features a melonite finished, 11.5" barrel with a 1 in 7" twist, making it capable of stabilizing medium- to heavy-weight projectiles of up to 77 grains. The P2 configuration comes equipped with a free floating, Adams Arms M-LOK handguard. The low profile P-series Micro gas block is 40% lighter than previous railed versions and fits nicely under the rail. Together, the forged A3 flat-top upper and handguard create a long, uninterrupted top rail interface with ample room for mounting optics and/or iron sights.