Frequently Asked Questions

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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Scope Mount Ring Screw Length

All American Defense scope mounts have been now shipping with all the same length screws in the rings. This has been done to prevent the old style shorter screws from being accidentally used in the bottom ring holes. Using the shorter screws in the bottom holes would strip the threads of the bottom rings because the screws were not long enough to ...

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