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1" tube on your Leupold?

Do you know the diameter of the eyepiece?

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1" tube on your Leupold?

Do you know the diameter of the eyepiece?

That appears to be a VX-R which has a 30mm main tube. Main tube diameter should not be an issue. The issues are the height of the centerline of your mount, the outside diameter of the scope eyepiece and the height of the folded rear sight.

The math formula for clearance is this:

1. Write down the height spec for the mount you are considering. That is the distance from the centerline of the rings to the top of the rail. Most mounts use this measurement rather than lower ring saddle height. That eliminates concern about main tube diameter. Most one piece cantilever mounts for ARs will be somewhere between 1.400" and 1.500"

2. Write down the outside diameter of your eyepiece.

3. Divide #2 by two. That gives you the distance the eyepiece bottom extends downward from centerline. Write this number down.

4. Subtract tbe number you got in step 3 from the number you wrote down back in step 1.

5. The result is how much clearance you have from the bottom of your scope to the top of the rail.

6. Write down the height of your folded backup sight.

7. If the number you wrote down in step 5 is larger than that in step 6, your backup will fit under the scope.

I like to see a difference of at least .060" so there is a little gap. If you don't have calipers to measure these dimensions they are usually published on line for each component. This formula will work with any combination of mounts, scopes and backup sights.