I have a very old Walther single shot 22, heavy barrel, Mauser 98 style safety, rather plain wood stock. I dont know how to post photos (one of my great frustrations is computers), but what I am looking for is a recommendation for early Walther parts. I have searched the internet to my ability and not found much. I had always assumed that it was a Model V but I did run across a photo that suggests that it is a Model 4. What I would hope to find is an extractor. It has a shop made extractor now that is fine with sub sonic ammo, but gives case rim bulge with normal high speed ammo. I worry that someone will put some hot 22 ammo in it and cause a burst case and eye damage. Any advice is welcome. Thanks, Grant.