AR-STONER AR-15 SIDE CHARGING PISTOL UPPER RECEIVER ASSEMBLY GEN 2 5.56X45MM 7.5″ BARREL 7″ ULTRALIGHT M-LOK HANDGUARD

The AR-STONER AR-15 Side Charging Pistol Upper Receiver Assembly Gen 2 features a 7.5″ barrel with 7″ Ultralight M-Lok handguard. The 7.5″ barrel is a M4 contour, made of 4150 Chrome Vanadium with a matte finish. It also features a 1:7 twist rate, and a pistol length gas system. The upper includes a 7″ M-LOK rail, a bolt carrier group, a si