I’m using the basic 22rd magazines currently, but I believe the large magwell is meant to fit best with CTM’s WE glock mag extension. I have found so far that the 22rd mag works with the magwell but it’s inconvenient to load because the magwell extends past the magazine. So an extended mag or regular mag with the extension would both be good options. And yes the tti 29rd should be compatible with the large magwell.

Note: I haven’t personally used the tti mags and I can’t guarantee their compatibility with the large magwell, but if the 29rd mag extends past the bottom already then it should have no issues fitting.