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AD-B3 Modular Base

The AD-B3 modular base is the large base in our modular lineup. Standalone it is mount for for the full sized 3x Power ACOG scopes, such as the TA01, TA11 and TA31. Also fits scopes with similar ACOG Style Bases such as the Burris AR-332 and newer model Trijicon RX-30 optics with 3 inline mounting holes. The overall length of the base is 3.5" and the centerline height with a TA-31 ACOG is 1.62". It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock(tm) Lever system to accommodate both in-spec and out-of-spec rail systems.

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 Modular base features the Patented QD Auto Lock(tm) 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 Modular base 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 Modular base has the following specifications:

  • Weight: 3.00 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].

Should be standard on any ACOG style optic

I recently purchased A 3X Primary Arms prism scope and wanted to use this mount, QD was the main reason. If you plan on using the riser with it go to Ace Hardware and get 2 10-32 X 3/4'' button head screws, YFS, and you are good to go. A very helpful ADM associate responded to my inquiry very quick and I was able to use this mount with no problems. Keep up the fantastic work ADM!!