Most here already know this, but wanted to give a shout out for Doug and Cameraland. I bought a set of medium rings for a picatinny rail. Once I set my scope in them, I found they were way too high for my liking. I sent them back with a note, asking if I could exchange them for “Lows”. The lows just arrived. Quick turn around and great customer service. Thanks Doug!

Ps. Anyone going to a rail and rings, lows are plenty high, even for 50mm objectives. Just fyi.