That is really good information, that I did not know. When I had a Ruger 22/45 threaded, the gunsmith did an outstanding job, but the threads sit much deeper in the can than they do on my Ruger 10/22 or my Walther P-22. I have to be meticulous about keeping the threads clean to go easily back and forth.
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell