I recently purchased a set of BAT direct mount 20 MOA scope rings for my BAT MB action. There is an arrow and a F and R on each ring that is obviously used to determine which one goes where but I'm wondering exactly what they mean. Does the arrow go toward the muzzle or the action and where does the F and R go? I would assume the F would go nearest the muzzle and the R nearest the action. I could measure the height as they will be slightly different due to the 20 MOA but I thought I would just ask to make sure.