I just acquired a Ruger LCP. I bought an extra ProMag for it and 2 cheap grip extensions. The hole in the bottom of the extension is larger than the Ruger mag. The ProMag won't seat with the extension mounted, and the ProMag won't seat with a full 6 rounds in it. Sounds to me like the ProMag is not a great accessory for this model, but if anyone has any tips or hacks for making it a little more functional, I'm all ears