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9/19/2017 7:27:10 PM
Posted: 9/15/2003 10:35:28 PM EDT
It would seem to be obvious that'd it work, but has anyone tried a .40 USP mag in a .357Sig USP?

My .357Sig USP mags are clearly marked so on it's side but I haven't compared it to a .40 mage yet.

Thanks in advance.
Link Posted: 9/16/2003 4:17:29 PM EDT
When I had a 357sig I had 2 40 mags that worked in it. They are the exact same mag just marked diffirently.
Link Posted: 9/19/2003 6:27:55 AM EDT
The USP Compact 40 S&W and .357 SIG mags are completely interchangeable. They work perfectly in either. However, if you have a full size USP 40 with an aftermarket .357 SIG barrel, all bets are off. There have been numerous reported feeding problems with the aftermarket .357 SIG barrels that seem to be magazine related. But for the compacts, go for it.
Link Posted: 9/22/2003 8:49:03 AM EDT
Best place/price for an aftermarket Compact 357 Sig barrel?
Link Posted: 9/22/2003 9:24:50 AM EDT
Probably Bar-Sto, perhaps Jarvis.
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