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.The little tab on the front strap of the 19x prevents some other Glock magazines from fully seating in the 19x and they won’t work.