If you want precision scope rings built like a tank these are for you! - UTG Pro P.O.I Picatinny Rifelscope Rings, 30 mm

I purchased these rings to install on my new x bolt Browning rifle after installing a 20 MOA rail on the receiver. I found that even with my 50 mm scope the medium height was too hi. I sent them back and got low rings and although they are still a little high they work fine. If you order them for use on a flat top AR the medium would work great up to 50 mm dia scope bell.