I was a "Stocking Dealer" for Smith & Wesson in the 1980s, so could order a "Dealer Sample" when new models were introduced. I did that with the Model 645 when it was introduced, and still have it.

I note mention of magazines with rubber bases. Both of the magazines that came with my early Model 645 have steel bases. I was not aware that later Model 645 pistols were shipped with one magazine with a rubber base.

I have several later Model 4506 magazines with the polymer base and various colors of followers that I use with the Model 645 and various Models 4506, but I have never seen a Model 645 magazine with a rubber base. Is the base on such magazines really rubber, or is it actually polymer?