i have 2 burris AR P.E.P.R QD's
i swap them between 25 sharps. 556's and 2 752x39's. the usually are within 2 inches on any one.
one is 30mm with filler rings for 1 inch. still works fine
i'm happy with them

the consolidation of the states into one vast republic, sure to be aggressive abroad and despotic at home, will be the certain precursor of that ruin which has overwhelmed all those that have preceded. Robert E Lee
~Molɔ̀ːn Labé Skýla~