The American Defense B2 Modular Base (brand part no. AD-B2-STD) is the medium base in the company’s modular lineup, sized as a standalone mount for 1.5-3x mini ACOG scopes. At 2.1 inches long it also fits several prism and thermal optics, and it is designed to accept a range of risers when you need a different height. American Defense Mfg machines the base from 6061-T6 aluminum and fits it with its patented QD Auto Lock lever. That lever lets you pull the optic and remount it without losing your zero. It is a clean choice for an AR carbine running a compact magnified optic.

Key Specifications

• The overall length is 2.1 inches, the medium size in the B-series modular lineup.
• Standalone, it is made for 1.5-3x power mini ACOG scopes such as the TA33 and TA44, so those optics mount without an adapter.
• It also fits the Nvision Halo LR thermal scope and the Sightmark Wraith Mini.
• It fits the Primary Arms GLX 2x and SLX 1x and 3x prism scopes as well.
• Rise is 0.24 inch for this non-cantilevered base, which keeps the optic close to the rail.
• Centerline height is 1.19 inches, the number to check against your iron sight and cheek weld setup.
• The base is made to accept several risers, so you can raise the optic for a different sightline.
• The body is 6061-T6 aluminum with a hard-coat Type III Mil-Spec anodize finish for long wear.
• The patented QD Auto Lock lever adjusts with a finger or a flat-blade screwdriver and can be set to lock to the front or the rear.
• It clamps both in-spec and out-of-spec rail systems, so it seats securely on rails that run slightly off dimension.

Frequently Asked Questions

Which optics fit the B2 base? Standalone, it fits 1.5-3x power mini ACOG scopes such as the TA33 and TA44, the Nvision Halo LR thermal scope, the Sightmark Wraith Mini, and the Primary Arms GLX 2x and SLX 1x and 3x prism scopes.

Can I add a riser? Yes. American Defense designs the B2 base to accept several different risers to suit a variety of optics.

Do I need special tools to adjust the lever? No. The QD Auto Lock lever can be adjusted by finger or with a flat-blade screwdriver, and it can be set to lock to the front or the rear.

Buy the American Defense B2 Modular Base for Mini ACOG

A good base decides how an optic sits on the rail every time you mount it, and American Defense Mfg builds the B2 with that in mind. See more scope mounts and order from our Lubbock, Texas gun shop for fast, insured shipping.