fuzzymcnab,
As JohkHL stated the 9mm magazine will latch into the Shorty Forty just fine. I don't have a 9mm double-stack to check feeding, but my money is that it would work just fine as JohnHL stated his 4013TSW does. The best way to know is try it! As long as the .40 sits high enough in the magazine so the stripping rib on the slide will strip the rounds from the magazine there is no reason a 9mm magazine won't work. At worst it would be necessary to spread the magazine lips just a few thousandths!
The .40 magazines have a large bump about 1/2" above the base plate to prevent them from being inserted in 9mm guns, but there is nothing keeping it from working the other way. If all else simply use the 11 round 4006 magazines! They will hang out a bit and look odd, but there is no reason they shouldn't work just fine.
If the price is right for the Shorty Forty, and it has at least 2 factory magazines, I would go for it, they are really nice guns. I will say I like the look of the 1st & 2nd issue guns better that the Mk III, but there aren't that many around to be too picky if you want one!
Here is a link for a 9 round .40 magazine for the 4056TSW from Bud's Gun Shop. The disclaimer says it could be a stock photo that doesn't represent the actual item, but it sure looks like a Shorty Forty magazine to me except for no Performance Center logo on it!
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Gunsmithing since 1961
Last edited by Alk8944; 10-21-2016 at 12:09 AM.
Reason: Add Bud's link for magazines
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