Oops, value.

If the 9mm stuff is added and at it’s worst you have a complete original 52-2 with .38 slide and barrel and a magazine or two, I can help with market price/“value” of that. The 9mm additives are a shot in the dark for what is likely to be one-off parts that are custom made.

If I were in your shoes and the guy can bring it to a range and you can try both .38 and 9mm out of it, I’d be pretty excited at the range trip. My opening dollar would be based squarely on the known stuff — the original .38 setup. I’d be working upward in $$ from that point.