[zeroadnan]

How do you decide on how high the scope rings should be?

Scope ig going to be mounted on an AR-10 type rifle.

 

[QB 45]

That depends on how big your objective lens is. I like to keep my scopes as low as possible, but the bigger the objective lens is, the higher the rings need to be to accommodate it (like, say, 50mm). Other than that, it's just preference and what's comfortable to look through.

 

[iwannausername]

The world of physics says mount it as close to the bore of the rifle as you can. Which means it depends on your mounts and the lenses on the scope...