The grip adapters arrived today. First impressions:
1. They make the gun feel like a full-size gun, albeit with a more pronounced pinky finger rest than the actual full-size frame. Still points naturally.
2. They're made from a firm yet soft rubbery substance. Kind of feels like a silicon pot holder from Ikea. Good tackiness.
3. They fit well to the mags, but can be easily bumped. I can see the thing slipping down over time if you carry a mag bullets-down like most folks do.
4. During basic dry mag changes, that doesn't seem to matter. Shove mag in mag well, and the adapter slides down until it seats on the floorplate as usual. I'd want to really wring these out on the range, though, before I use them on a carry mag.
5. I'm also curious to see how the material handles Arizona summer heat. Will it get slimy/sticky? Will it cause my shirt to cling to it and produce printing/tells? Time will tell.
6. Overall, I like them, provided #3-#5 doesn't prove an issue. Given the overall price of 13rd 92C mags these days, being able to use my full-size mags as reloads is a great thing.