Fantastic 7.62x39 upper - Maxim Defense Industries PDX U.R.G. Mil-Spec Upper Receiver

This is the second Maxim Defense PDX upper that I purchased. Both are 7.62x39. I mounted it on an Aero precision lower with a trigger tech trigger, and run the JP H2 buffer system. It runs flawlessly, I use 20 or 28 round Duramag magazines. Never a hiccup, Runs smooth but does have a fireball at the muzzle.
It is truly a robust upper., solidly built. It is the most fun gun that I own.