In Kenk's thread about likes and dislikes I found out that the magazines, but for a small hole in the front, were the same as EAA Witness mags. Yay! Something that may be of interest to those who carry their P40 is the Henning Group website. They sell a spring and follower to fit 15 rounds in the flush fit Witness mags for 20 bucks. 1 round might not be a big deal but I figure for SD carry every round extra is a potential life saver. They also sell extended base plate for a 19 round capacity . Pretty pricey but for backup mags and or range time it might be worth getting a few. Here's a link if you're interested. https://www.henningshop.com/ (https://www.henningshop.com/)
Just thought I'd let everyone that has or is contemplating th Grand Power 10's that there are different capacities available. I love this gun more every day and as soon as I figure out a way to drill the holes in all my Witness mags without screwing something up I'l be set for anything! ;D
Thanks Da/Sa Fan
Follower is slightly different between the two magazines. The cut for the slide stop is deeper on one of them (can't remember which). Both followers lock back the slide on my P40 FWIW.
If all else fails you can take the mag body to any good machine shop and they should be able to put the needed cutout in the mag very quickly. I attached the numbers I used for modifying mine.
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Thanks Azrckcrawler
Yep, I did notice the slight difference in the followers, but as you said they lock back and feed just fine. Thanks!