I bought a Charter Arms AR 7 years ago. I had to buy the stock separately, then the butt cap. I have never been able to get it to feed properly. I don’t mess with it very often. On Black Friday I bought some cheaper-than-Federal rounds. Not a chance of their working, though they do fine in my Ruger Mark IV. Then, taking it apart, I could not disconnect the receiver from the stock. I tried light lube. I tried tapping it with a rubber hammer. When I googled it, all I got was about AR 15. By now everyone is either rolling on the ground laughing, or typing a post that begins “Look, moron . . . “ And yes. I finally remembered the thumb bolt at the base of the grip.” Don’t let your giggles keep you awake!