I may have what you're looking for -- magazine well, etc. with spring loaded catch. If you can e-mail me a drawing or picture... Otherwise I'll try to get a photo or two for you to inspect. wkerns@elmore.rr.com
I need a C,D or E bolt , got a killer 104122 serial # C action /bar from CMP ,got everything but the bolt,Thanks WJC 770-748-2732 or <muffin403@bellsouth.net>
If you are still looking for parts you might want to try Wendell at Out Back Gun Parts. His number is (812) 945-0480. He doesn't have a website or e-mail that I know of. I have not talked with him for a couple of years, but he used to have a pretty good inventory of 52 and other older gun parts.
Jim