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The .40 S&W version had a recall and had a problem with the safety. These
two guns share a lot of the same parts - the slide is the same, the hammer
is the same, the recoil spring and the main housing is the same as well as
many other parts. The rear block does, however, differ between the two
guns. The rear block is an internal piece that contains the hammer pivot,
rear slide guides, and safety/decock mechanism. It always struck me odd
that the rear block would be different between the two guns because there is
no obvious need to differ in this area. The only thing I can guess is that
the .40 is a more powerful a round and perhaps they had to beef up the rear
block to handle this additional load while still meeting their life
specification. This difference could also explain why the .40 had a problem
with its safety while the 9mm didn't.
So I can highly recommend the 9mm version but I would need more information
on the .40 S&W. The only negatives with the 9mm I can think of is the gun
could be a little narrower and the double action trigger pull is a little
harder than I would prefer, but these are really minor issues and I'm
mentioning them just to present a balanced view. A hidden benefit with the
9mm is that one can buy and use the .40 mags with 9mm ammo and effectively
get 12 round 9mm magazines.
Hope that helps.