I just ordered my donor gun for a DR build. It's a Sauer & Sohn s x s from the 60's. I paid $245 shipped from Simpsonltd.com . If you have never checked out this site, DO IT! It' really cool. I'll be posting pics as soon as I get it and figure out how to post them. I would like some suggestions on calibers though. I'm still undecided on this matter. I would also appreciate any help I can get from you all here. You're my only link to doing this kind of thing. Thanks I'll be eternally grateful for the help.