not that i doubt you however..
military specs to modify for drill use.
weld a plug in the breach, usually a 3 inch steel rod,
cut a section of the chamber with a torch, to weld said rod into the breach.
weld the barrel to the reciever, usually a 1 inch weld on the bottom side.
grind the firing pin tip off, weld the striker hole at the bolt face,
install the bolt, weld accross the cutoff down, so the bolt cant be removed.
remove the front sight blade or grind it off.
the few hundred or so i delt with were done this way, some more then others, some much less.
i need to know these things if you want them made into shooters.