Sorry for the OPs problem.

Lots of people buy used guns w/o issues, I don't go there. The only way I would buy a used gun would be if I knew the person selling it well.

My concern would be that someone would handload wildly overpressure rounds and overstress the gun, something, unless really obvious, couldn't be detected w/o magnafluxing or other scientific test.

Just my 2 cents worth. Don