I just finished putting a gen3 on my RPR earlier today and got the ATACR mounted as well as my suppressor. I’m hoping to take it out for a spin when the weather improves. I’ll try to post and update then.
I haven't, but I don't think it would work well. I have a Savage Stealth with the PRS3 and even with the cheek rest all the way up, it is about 10 mm too low. I think it works well on ARs and RPRs because the bore axis is more in line with the stock mount.