I just received my Savage 110 BA in 300 Win Mag and have a Night Force NXS 3.5-15x50 with a BORS unit. Now I need to get the Barrett rings to mount it all. I am not understanding the moa terms that are stated when buying rails, rings etc. Can someone explain how this works. I know it has to do with the amount of adjustment in the retical so you can reach out to 1000 yards and beyond. Am I going to need the Barrett adjustabel moa rings? I have been shooting all my life but not at the yardage this rifle is capable of. Thank you for any assistance.