The problems with the frames occured in the 1st gen 40's.
As for partially supported chamber... Unless you plan on shooting full pressure or +P handloads, it will never be an issue.
Tell that dealer to suck a fart, cause he's trying to get you to buy something from him.
I could make a list of a bunch of guns i have, or "have", or wish I had. Why would one feel compelled to provide that infornation freely? Do you feel the need to show off? Is it some immature game of oneupsmanship?
Why do you feel it necessary to list your guns?