Quote Originally Posted by Swamp Rat View Post
The word from Glock was that the metal mag catch will eventually wear the polymer in the frame. Metal vs polymer + movement is not a good combo.
I wonder if adding some graphite would mitigate this (possible) issue?

Metal on polymer, if both smooth, IMHO, should not be of a concern. Especially when it's only moving ~5/16", in the same directions, at a slow rate of speed. Granted, if it were a SUPER-FAST motion that actually built-up friction, then yeah, it makes sense, as the polymer would heat up and fail/warp before the metal...

The angle of travel has essentially no resistance, minus the spring. As long as a metal magazine catch is free of burrs and if properly finished/machined, I just don't comprehend how this could be a problem.

One of my 43's are running Shield mags & a metal catch. Another is with OEM release/mags. I don't have enough time on the modified one to have a (possible) issue develop.