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Old 05-15-2007, 07:28 AM   #1
Join Date: Nov 2003
Posts: 571
Magazine question

I have four hi-cap mags for a STI that are 9 mm. What do I have to do to use them in a forty? The forty bullets will fit in the magazine and appear to cycle fine. I am in a position that I cannot go and shoot at this time and want to have them ready when the time comes.

Any ideas or suggestions?

Thanks, Buddy
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Old 05-15-2007, 01:18 PM   #2
Join Date: Nov 2001
Posts: 951
9mm To 40

I'll let You know about this......When I get time to build a Jig and mandrel....I've got 10 or so I'd like to change......BUT.....I"ll bet the capacity won't be the same. The 9mm mags have deep groves on both sides.... THe 40s deep on one side, Shallow on one side.

Bill caldwell
Old 05-16-2007, 09:52 AM   #3
Join Date: Mar 2007
Posts: 305
In a standard 140 mm mag that's unmodified you'd normally get 18 rounds of .40 in it, more if you fiddle with the spring, follower, and basepad (mine are 20 rd reloadable). In a 9mm mag, off the top of my head I'd guess you'd get no more than 17, and more than likely just 16 in it.

Just get some .40 tubes!
Old 05-17-2007, 07:24 AM   #4
Join Date: Nov 2003
Posts: 571
I was thinking if I can make them into forty mags, I would be able to use them in practice. When I'm practicing I load no more than six rounds to force reloading.

Wild Bill, I am up on one crutch as of yesterday! I am 3 months ahead of predictions. :wink:

Old 05-30-2007, 12:26 PM   #5
Join Date: Aug 2001
Posts: 16
You'll likely need to adjust the feed lip dimensions - somewhere between .380-.390" is the spec for S_I 40 mags.

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