No4 Scope mount holes misaligned and drilled too deep?

[Patrick Chadwick]

and third and more worrying, the holes seem to have been drilled right through the receiver and into the top of the barrel threads

Quite right to be worried. In Mauserland the rifle would be viewed as unsafe by a proof house. My local dealer showed me a Mauser where Bubba had done just that. The proof house refused to accept it for proof firing. Then he had welded up the holes, and presented it again. Bubba now has an officially condemned wall-hanger.