I have not yet made the transition to carrying magpul mags, but unmodified they have no had any issues - the only issue I have seen is with a Zev extension on a magpul 17 round magazine not functioning properly - had consistent failure to feeds in my gen5 19 last go around, might be the spring, might be the mag, either way it does work well. The 17 round and 21 round magpul mags have given me zero issues or problems with various mags, I would not have an issue carrying with them but the gen5 mags seem to be lightly better designed (I like the extended plate design).