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AD-B3-C Cantilever ACOG Mount-(2109)

The AD-B3-C Mount is a one-piece ACOG mount that adds .64" to the overall height of the optic (2" Centerline Height with a 4x32 ACOG). It allows for a rearward position of the ACOG and similar sights while clearing the MBUS PRO back up iron sight. The AD-B3-C mount fixes the eye relief issue commonly found with mounting the optic traditionally. The 2" reverse cantilever will allow the user to place the eye piece of the optic much farther rearward without interference. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock Titanium Lever system to accommodate both in-spec and out-of-spec rail systems.


**This mount will only clear the Magpul MBUS Pro Rear Sight**

This mount also fits the Sightmark Wraith Digital Night Vision Devices including the HD 2x, HD 4x, 4K, and Mini 4K and Trijicon IR-Hunter Thermal Sight. The washers in the included hardware kit are only to be used for the Sightmark IR scopes (4k, 4K mini, HD, etc)

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The AD-B3-C Mount features the Patented QD Auto Lock Lever system which has the following advantages:

  • Does not require proprietary tools for adjustment.
  • Can be adjusted with your finger or a flat blade screwdriver.
  • Lever can be configured to lock to the front or the rear.
  • Superior clamping surface to insure maximum rail engagement.

Materials & Construction

The AD-B3-C Mount is precision CNC machined from a block of 6061 T6 aluminum and finished in hard coat type 3 Mil-Spec anodize for a rock hard lasting finish.

  • Precision machined from 6061 T6 Aluminum.
  • Hard coat anodized for a lifetime of performance.
  • Fully adjustable to fit both in spec and out of spec rail systems.
  • American Defense MFG, LLC. products feature a lifetime warranty.
  • Features the Patented QD Auto Lock Lever system.
  • Made with pride in the U.S.A.


The AD-B3-C Mount has the following specifications:

  • Weight: 2.8 ounces

FFL Terms and Conditions - Any items placed on the same order as a firearm/lower receiver will also be shipped to the FFL. If you would like additional items shipped to you directly, please place them on a separate order. To expedite your order, please have your dealer fax or email their FFL to us. If the dealer you are using to transfer a firearm has not sent us a currently updated FFL to put on file, there will be an extended period of time needed to process your order. Due to the high volume of orders, please allow up to two weeks for delivery of firearms. Email: [email protected].

Great mount, convinced me to keep my TA31F

I had been looking for alternate ACOG mounts that allowed the use of a BUIS behind the optic when mounted but had been leaning towards replacing my ACOG with an LPVO that I could be more comfortable behind. I really enjoy the extra height built into this mount, head position is comfortably more upright, sight picture is extremely fast to acquire, the additional options for eye relief this mount offers is great for achieving a comfortable LOP on your platform. It doesn't say it in the description but this mount also clears Midwest Industries combat rifle BUIS very nicely.
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