Terrible fit renders useless - CAA Micro Conversion Kit for Glock 20/21

I watched and read so many great reviews about this, that it is the absolute must have accessory for any handgun. Maybe I just got a bad one but mine is a useless piece of plastic with expensive accessories attached. If I could give this zero stars, I would. I really wanted to like this, but I haven't even been able to use it and I'll tell you why. Sliding and locking my Glock in place seizes up the slide of the gun which is attached to the charging handle of the mck frame. If it is seized up, I cannot rack the slide, therefore I cannot load the gun. I dare not put the gun in the frame loaded, that is just not safe. It is such a poor/tight fit that once I pull the gun out (with a great amount of force) there is terrible wear and marks on the slide and picatinny rail of my Glock. My very lightly used gun now looks like it has been aggressively abused. My last attempt will be hopefully that Optics Planet sends me a new mck that fits better and therefore is actually functional.