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AR15.COM
9/28/2004 3:30:44 PM EDT
Will USP-F40 mags fit and function in a USP-F9 ?
10/1/2004 10:29:53 AM EDT
[#1]
Fit?  Yes.

But the wider feed lips mean you might have some feed issues with the narrower 9mm cartridge.
10/7/2004 2:32:23 PM EDT
[#2]
I've never had a problem.  But, if you have feed problems, like a round popping out, you can gently heat the feed lips and push them together a little.

Is it worth all the work?  Probably not, you only get 12 9mm rounds in a low cap .40 cal magazine.
10/7/2004 4:20:42 PM EDT
[#3]

Quoted:
Is it worth all the work?  Probably not, you only get 12 9mm rounds in a low cap .40 cal magazine.



Ahh.... but if you have you have full capacity .40 mags.... ...