I just ordered this mount and it won’t work with my R1 Aimpoint and I am going to follow some advice I was given that for shotgun a larger reticle would be good. I am debating a Leupold 7.5 Delta point I like the Triangle because my Slugs shoot higher than my shot pattern. I was going to use the tip of the Triangle for slugs and cover the target for shot. But then the RMR looks more rugged it just does not have the reticle I want and I will have to modify the mount to make it work.
Pat
http://www.arredondoaccessories.com/category.cfm?cid=1004,2008&PID=jk29i1334yuaxn&GID=

Pat