A curveball barrel is one thing, but I have to say that this machining is something that should be sent back instead of trying to fix. I am curious how the rear screw would fit through the trigger assembly, tube, cap, breech and cap? I ran into a situation with my riser block having to be aligned very well or canting the breech would bind the hammer cocking pin and block pin against the slots in the breech making operating the bolt impossible.