Chambered in 7.62x39mm with a 10.5-inch Bear Creek Arsenal parkerized heavy barrel with a 1:10 twist and a carbine length gas system. We named this platform the PDW because it is a Personal Defense Weapon. The 10.5-inch barrel provides a similar velocity to a pistol-length AK-47, while enhancing accuracy with the AR-15 platform. We suggest the typical steel case 123 grain ammo. If you want a reliable, accurate weapon that can use cheap ammo that can be bought in bulk this is what you want.