Johnson M1941 Blank Fire Trainer

I have this interesting Johnson trainer for sale. Not sure if it’s converted from regular Johnson rifle or made this way from beginning. But the action does looks the same as M1941. Top of the receiver marked “for blank only”. Serial numbers mismatched. Action not welded or seized but needs some work to get it working properly. No charging handle or magazine. See pics for details. Asking only $450 as part gun or display item. Shipping on buyer if needed.