From 80% Arms:
Designed for shooters with larger hands, or who want to utilize Glock 17 magazines and still fit flush in the magwell, the GST-9 Full Size Grip Module will add an extra .41" to your grip.
If you are looking for a full-size pistol, want to use full-size mags, or just want to pick up another color to accent your pistol, GST-9 modular grips have you covered.
