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40 S&W Pistol FAQ
Can I convert a 40 S&W pistol to 9mm?
Many models accept a 9mm conversion barrel and 9mm magazines because they share a frame. Check that the manufacturer or barrel maker lists your exact model.
40 S&W or 9mm?
40 S&W hits harder and recoils more. 9mm holds a few more rounds and costs less to shoot.