Pretty sure he is looking for a stripper guide for AR mags.
https://www.cleanammocans.com/10-pack-.223-5.56-AR15-Stripper-Clip-Guides.html
I picked up mine at a gunshow a few years ago. I have several and am in Jeffersonville. Hell, I will be glad to give you one, we just need to figure out when you could stop by my place or meet up somewhere.