Sorry for the confusion on the barrel.
http://www.gem-tech.com/store/pc/Walther-P22-S-W-M-P22-Adapter-25p21.htm
Edit - I think I'm looking at the link wrong. That adaptor is changing the thread pitch and size on an already threaded barrel. My apologies.
http://www.gem-tech.com/store/pc/Walther-P22-S-W-M-P22-Adapter-25p21.htm
Edit - I think I'm looking at the link wrong. That adaptor is changing the thread pitch and size on an already threaded barrel. My apologies.