Not for .40 - CAA Micro Conversion Kit for Glock 20/21

My g22 gen 4 .40 cal , has nothing but problems feeding and ejecting. On top of that it breaks the rear sight off the pistol! I don’t recommend this product unless you like broken sights. I really like the idea, but it has to work in order to be a good idea.. Do Not get this for a .40 cal , you will be disappointed. . . For 9mm , I don’t know. Thanks for a product that doesn’t work, I really appreciate it.