I can't think of anything else than to check if the stock sits tight on the stock lug and that the leaf spring in the rear sight is strong enough to keep sight down under firing. That in addition to the regular things you would look for when purchasing a Luger..
I'm no expert on LP's. I guess half of the reason for my posting, is to justify the two sentences below
If the deal don't fall trough, give me a hint.. As you probably know, they are not so easy to find in our little part of the world!