Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:309058.

Thumb saver for a 22lr High Standard with a military style grip. This is full length and locks in place so you can load all 10 rounds with ease. This thumb saver may work on other High Standard 22lr mags, but it might not hold the slide all the way open.

I have another that is a half length thumb saver that uses less plastic and is more of a universal design for 22lr pistol mags, but you will have to hold onto it the whole time. I just like having the options.