I've never seen the rails get mangled that badly. usually it's the rear blocks that get chewed up. I have an extra set of rails from a top-RF Speed - they're fine. The tiny groove in the rear blocks was completely trashed - the top lip just peeled away. It's the inevitable result of someone trying to close a Speed/Crown without racking the rails back fully. And, it renders the camera mostly unusable (unless you're patient enough to deal with the rails coming untracked every time you open and close the camera).