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***BCG NOT INCLUDED*** THIS KIT IS EVERYTHING YOU NEED TO BUILD A MICRO AR PISTOL EXCEPT A STRIPPED LOWER AND BCG. The receiver is a flat top M4 Mil-Spec upper receiver are forged CNC Machined from 7075-T6 Aluminum, the hardest and most durable material of any upper. The MICRO 5″ 7.62×39 barrel is made from 4150 Chrome Moly steel, has 1:10 twist rate & MICRO gas system. The handguard is a 4″ CBC Rail. Barrel: 5″ 7.62×39 Barrel Chrome Moly Twist Rate: 1:10 Feed Ramps: M4