Porter, all my other mags, including magpul, ETS, and even my 33 rd mags ( made for the Glock 17 ) fully seat and work like thy should, not sure what kind of koolaid you have been drinking. Of course Glock 19 mags will not fit into a Glock 17 lower.
Apparently gen 5 Glock Mags have a little extra lip on the front of the mag that gets blocked by the front of the 19x frame.