Gun Parts & Accessories
I have three lightly used A&G Grip Extenders, these slide over the G17/22 mags to fit in either a G26 or G27. Here is a link if you need to see what they look like: https://www.glockmeister.com/AG-Grip-Extension-for-G17_22_31-Mags-in-G26_27_33/productinfo/PK03851/
I would sell all three for $20...