I just went to the range tonight with my wife's 9mm Shield and, while I was there, I ran into a member who has a .40 Shield. So we traded for one magazine to see how the other one shoots and I would have to say (and he concurred) that there is virtually no difference between the .40 and the 9mm as far as recoil is concerned. I didn't notice any "snappiness" at all.

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G21C,Shield.40,LCP