Anyone got any experience with them ?
Just ordered a couple of them(the kits to work with the existing Mags) in 10MM for for my Glock 21 with Storm Lake 10mm conversion barrel.
Expecting good things but you never know.

Got em in a week,took about 15 minutes to Assemble with Factory G20 Magazine
Starts getting hard to load at 30 round mark using just the fingers ,functions fine.

https://gunmagwarehouse.com/kriss-vector-gen-2-glock-20-10mm-33-round-magazine-extension-kit.html