High Quality Tactical Weapon Components | TangoDown, Inc
So the glock frame being polymer, will get scratched by ANY tool you put in it regardless of design. I would get this tool again but, with curbed expectations. Yes its better than a flathead, coat-hanger, etc. I think it could be better still though. My recommendation is to blend the bevel and the curved surfaces behind the tip of the hook with a red wheel.
Ignore the price plus shipping and just buy it. Works so easy the first time that it's worth every penny even if you use it just a few times in your life. The number of saved curse words is immeasurable.