I replaced the 9mm3 followers with the 9mm7 and trimmed the mag side as indicated above.

The 9mm7 followers in the 10 round mags seem rock solid. Night and day different from the stock followers.

I haven't tested them out yet but they inspire confidence already. Between the 9mm7 with trimming and the Magpul, if they both function well, I'd probably lean toward the glock mags for carry. But both are probably fine for range.

Hope to test soon and hoping that the new followers solve the issue once and for all.

Thanks again for all the help!

I tested the glock 10r mags with the 9mm7 followers, trimming the mag as needed (easy and quick following the pics above).

Quick testing - no failures with the JHP in either the 26 or the 19. Tested about half dozen mags.

I also re-tested the JHP w/ the stock mag and 9mm3 follower - failed to feed w/in 5 rounds.

So, this is a confidence booster that the glock mags w/ the fix above (9mm7 + trim) is a possible solution. The magpul mags need more testing but they seem solid as well.

Thanks again for all the help!! Much appreciated!

Glad it all worked out for you.
Put all those 2183/9mm3 followers in the garbage can for good.