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Make sure to do your research first. I carry a p320 x-vtac, and i wanted to up my carry abilities from 17. Surprisingly, 2 of the extensions transformed my 17rd mags into 23rd mags. I have no complaints. Just make sure you install them correctly. It can be a bit confusing on how to get the spring and mag in place, but it's easy when you figure it out. Make sure to screw the grub screw in all the way with the metal flange put in the correct way. I'd honestly buy again. But for the price of genuine sig mags, i just buy extra 21rd extended mags from Sig. Cheers
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