The one I had was a total POS. The barrel isn't screwed into the receiver. It just slides in and is held in place by a shim. The problem is that the shim is held in place by the nylon stock. Mine was slightly worn and allowed the shim to move which in turn allowed the barrel to move. Every 8 or 10 shots the barrel would move and throw it off at least 10 MOA...and that's not an exaggeration. The only fix was a new stock and the gun wasn't worth it.
