Put Vortex low (.87) rings on a Seekins 20 moa rail with a March 3-24x42 scope on a 308 FCP-K. Fits great and plenty of room under the objective (about 1/4 -3/8 inch). If I could have gotten a set of the Seekins low rings (.82) that would have been my preference.
Won't be home for two weeks - so can't post any pictures till then.