Here's a useful video on how to check if the parts match on a military Luger.
https://www.youtube.com/watch?time_c...&v=fDTQ327u5gA
Another option for selling your Luger is to consign with a dealer like Simpson. Dealers in general will try to talk you down a bit on price, and take 25% commission, however they can sell it for a dealer price so you get a little of the 25% fee back. In my opinion dealers are a viable option for someone who is selling just one item.