The rifle and hpa adapter work as they should. Only things aftermarket are the stock, grip, and little mock suppressor. No internal upgrades. As you can see this is the lm4 model with the dial hopup not the old style. Shoots good and has the field rocket valve in it. Rof is pretty slow with stock buffer spring but you can get aftermarket versions if you want to upgrade recoil or rof.
Rail and stock pistol grip are pretty good quality. Rifle is overall pretty solid. I believe I have extra TAPP gaskets and feed lips as well. Send a message if you have any questions.