caption says it all. who has them, who likes them, who don't like them and why? been waiting on my burris xtrii from o.p. for a while and they cut me a deal on a set of 6bolt rings for my rum project. I do have a question, the bolt that goes through the bottom, is it square to fit the pic rail or round? do yall think it will hold up to a 300 rum? thanks for your input!