OK, so a friend of mine is going back and forth between running QD or threaded. I am saying QD so that he doesn't have to worry about cross threading on his guns, and it is semi auto. Another guy is telling him that he will have to re-thread every gun in order to mount the QD to, and that he may as well go get them all threaded. I was under the impression that as long as your flash hider/muzzle brake was compatible with your suppressor, all you did was throw the can on top. Am I right or wrong?