Maxim Defense Industries MDX 510 U.R.G. AR-15 7.62x39mm 10.3 inch Upper Receiver Pistol Length 1-10 Twist 5/8x24 HATEBRAKE Arid

Maxim Defense Industries MDX 510 U.R.G. AR-15 7.62x39mm 10.3 inch Upper Receiver Pistol Length 1-10 Twist 5/8x24 HATEBRAKE Arid. It comes with either our Mil-Spec bolt carrier group or SCW bolt carrier group for those using our SCW system. For those wanting a standard length short barrel the 10.3 barrel of the MDX510 is your best choice. Like our other uppers the MDX510 includes our HATEBRAKE for increased reliability Radian Raptor charging handle and Maxim Defense hand stop Specifications for M