Accuracy Systems shows one mounted on a mini in the advertising pictures for the Williams Match sight, but they don't offer any info on the rail itself.
Borrowed picture link from their site.
Since my RR doesn't have the ejector pin, and instead uses the bolt stop as the ejector, the shell doesn't really eject upward so much as outward, so I can't really see it bouncing off the rail. Could be wrong though.
Maybe I'll drop ASI a line and see if they've used it, and what they think.
Thanks for the comments so far.
There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter.