American Defense Medium Modular Base with Standard Lever - Black Finish

The American Defense Medium Modular Base with Standard Lever is a precision-engineered mount designed to bridge your favorite optic to your rifle's rail system. Built on a modular platform, this medium base accepts American Defense risers to accommodate optics across different heights and styles, or runs standalone for scopes like the 1.5–3x ACOG models (TA33, TA44) that pair naturally with its dimensions. Whether you're setting up a dedicated patrol rifle, a recce build, or a designated marksman platform, this mount lets you configure exactly the sight picture you need.

Machined from 6061 T6 aluminum and finished in hard-coat mil-spec anodize, the AD-B2 is built to handle the field. The standard lever employs American Defense's patented QD Auto Lock system, engineered to lock solidly on both in-spec and slightly out-of-spec rail systems—a real-world advantage if your rifle or handguard isn't cut to exacting tolerances. The quick-detach design means you can swap optics or return to iron sights without breaking down your rifle.

The modular architecture is the key draw here. Unlike fixed mounts that lock you into one height or footprint, the AD-B2 accepts optional risers to shift your optic up for co-witness, lower scope mounting, or other sight configurations. That flexibility makes it a smart choice if your role or mission requirements change, or if you run multiple uppers and want a consistent mounting solution across your collection.

This is a mount for shooters who understand that optics aren't one-size-fits-all. If you value adaptability, solid engineering, and the confidence that comes from a proven QD system, the American Defense Medium Modular Base deserves a place on your short list.

Key Features

• Modular design accepts American Defense risers for custom height and sight configuration
• Standalone mount ideal for 1.5–3x compact ACOGs (TA33, TA44 and similar)
• Patented QD Auto Lock lever system locks securely on both in-spec and out-of-spec Picatinny rails
• Precision machined from 6061 T6 aluminum, hard-coat mil-spec anodized finish
• Quick-detach design for rapid optic changes or transition to iron sights

Specifications

Frequently Asked Questions

What optics work with the American Defense Medium Modular Base?

Standalone, this medium base is designed for compact 1.5–3x power ACOGs such as the TA33 and TA44. The modular design also accepts American Defense risers to accommodate a wider variety of optic types and heights.

Can I use risers with this base?

Yes. The AD-B2 medium base is built to accept American Defense risers, which allow you to customize the height and mounting configuration for different optics and sight picture preferences.

What's the difference between this and other American Defense bases?

American Defense offers modular bases in three sizes. The AD-B2 (medium) is designed for compact ACOGs standalone and accepts risers for flexibility. Larger bases accommodate full-size ACOGs and other configurations.

How does the QD Auto Lock lever work?

The patented lever system clamps the mount securely to your Picatinny rail and is engineered to lock solidly on both in-spec and out-of-spec rail systems. It enables quick detachment so you can swap optics or return to iron sights without removing the mount.