Need some info / advice. If I were to purchase a .40 barrel and bolt from quarter circle 10, and a magwell adapter from RRA, and installed these parts into a standard ar15 upper and 80% lower, do you think this set up will function? I'm not sure how proprietary these parts are, so I don't want to order and it not work. I like quartercircle's twist rate on their barrels, and want to use my 80% lower that I milled out. Any info is greatly appreciated