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The Smith & Wesson 5906 is the version in 9mm Luger, with a slightly shorter barrel and slide, and with a double-stack 14rd magazine. With the all steel frame, the weight and and lack of flex in these pistols makes them noticeably softer shooting than any of the later plastic framed pistols which replaced it.
With the Glock 17 coming out in the 80s, at a low cost, light weight, and with a 17rd magazine, it became very popular and took over a lot after guns like these, which gradually fell by the wayside. These days, you can get high quality, flush fitting 17rd magazines by MecGar, and these fit flush in the 5906, letting these old things be pretty competitive still (especially if you don't mind the weight for carrying, or if you outright prefer the feel of it and the hammer, like I do).