Your the first person that I have heard that had this problem besides me. I had the same exact issue about a year ago. Could not figure it out. Took it to Glock and the guy told me it was a spring in the slide that was messed up. Can not remember what the name of the spring was but it's an easy fix.
That's a pretty cool picture
Oh and who cares my friend. If their price is too high and you offer them retail, that's all you can do. It will sit there