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Old 07-13-2017, 11:21 AM   #1
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Magazine interchangeability - Sig vs. Kimber

After another day at the range, I have concluded that my big hands have a significantly better grip on my Sig P938 when I use their extended magazine. The way the base juts forward (left, in the picture below) provides a perfect rest for my pinky finger, and also tends to jam my fingers closer together when I squeeze the grip. In contrast, the extended grips for my Micro 380 (right, in the picture below) don't seem to help at all - in fact, they seem to allow my grip to slip lower in a way that feels less secure - probably because the base does not jut forward like the Sig.



I would like to modify the base of the Sig extended grips so they fit my Kimbers (both 380 and 9mm). I have read elsewhere in the forum that others have just shaved a little off the upper edge of the Sig base so the mag slips up higher into the Kimber grip, so that's the goal.

Does anyone know how to remove the base of the Sig magazine, so I can shave or sand off the top edge? It looks like it should just pop off, if levered in the proper location, but I don't want to take any chance on ruining it, for over $40 a pop.



Any hints, suggestions, or recommendations out there?

(By the way, my short P938 mags work perfectly in my Kimber Micro 9 Raptor , so I am certain that all I have to do is shave a little of the Sig extended base out of the way.)
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Old 07-13-2017, 12:43 PM   #2
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Howdy P8RIOT,

Yes, I've done several of the Sig Mags for my M380 & M9. The best way to describe is using the bottom picture in your post, grab the mag in the palm of your hand so you can provide perpendicular pressure to the side of the plastic extension with your thumb (from inside area) and press the side out and downward. Once you get the catch ledge unseated it can be slipped downward toward the top of the mag and removed for sanding.Its a little stiff the first time, but after that it gets easier. There are several posts about this, I believe I did one myself so you can search for it and see some of the pics.

Don't be too agressive, a little at a time works best. Hope this helps.....Good Luck !
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Old 07-13-2017, 02:59 PM   #3
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Thanks, Tejun - somehow I missed your post when I was searching before - nice summary, pics and all. And yes, that little bugger is TIGHT.
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Old 07-13-2017, 03:16 PM   #4
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One of my early learnings was to change the direction (eg. leading trailing edge) and not keep sanding in the same direction. My first one, I went in one direction and it resulted in the leading edge having more taken down than the trailing edge. Just did my last Sig mag I had for my M9 last week and switching up resulted in a much more uniform amount taken from both sides.
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