Frequently Asked Questions


Replacement Scope Mount Rings

We have recently changed the design of the rings used on our Recon and Scout series mounts. The photo below shows old and new style rings. Please specify which style ring you need if you have one that is damaged.

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Picatinny/Weaver Rail Fitment

American Defense Mounts will fit both Picatinny and Weaver rails. Our standard cross bolt width is .203″, made for milspec picatinny rails. We do offer a smaller bolt that is .187″ wide. Our mounts will fit some, but not all weaver rails. If the recoil lug width on the weaver rail is greater than .187″ our smaller .187″ ...

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ADM Mount Ring Screw Torque

The proper torque setting for our Scope Mount ring screws is 20−25 In/Lbs. Also, torque and tighten the bottom ring screws first, then torque and tighten the top screws. There should be a slight gap between the top of the ring halves. The ring screws are 9⁄64″ Allen. Rings do not need to be lapped, they are self-centering. This ...

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Calculating BUIS and Scope Fitment

To calculate if your BUIS will fit under your scope, you need the following information. The height of the BUIS when folded, the diameter of the eyepiece of your scope, and the centerline height of your scope mount. Please refer to our Scope Mount centerline height chart below. First, take the eyepiece diameter and divide it by 2. Next, subtract ...

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