The American Defense AD-AEMS is a quick-detach mount designed specifically for the Holosun AEMS red dot platform — this version at lower 1/3 co-witness height, raising the optic so iron sights appear in the lower third of the window. ADM's patented Auto Lock QD lever attaches and removes the optic fast with repeatable zero, and self-adjusts to in-spec and out-of-spec Picatinny rails without tools.
Machined from 6061-T6 aluminium with a Type III Mil-Spec hardcoat finish. Made in the USA.
Height: Lower 1/3 Co-Witness — also available in Absolute Co-Witness, 1.93 in and 2.33 in Night Vision.
How It Compares
Mounting a 509T optic instead? See the AD-509T mount. Browse all red dot mounts and rifle red dots; read our co-witness heights guide.
Ideal For
- Holosun AEMS optics on rifles/carbines
- Lower 1/3 co-witness AR setups
- Quick-detach with return-to-zero
Key Features
- Purpose-built for Holosun AEMS
- Lower 1/3 co-witness height
- ADM Auto Lock QD lever; fits in/out-of-spec rails
- 6061-T6 aluminium, Type III Mil-Spec hardcoat; USA-made
Technical Specifications
| Fits |
Holosun AEMS optics |
| Mount |
Picatinny (Auto Lock QD) |
| Height |
Lower 1/3 co-witness |
| Material |
6061-T6, Type III hardcoat |
| MPN / UPC |
AD-AEMS-11-STD / 810104930307 |
What's Included
- American Defense AD-AEMS QD mount (lower 1/3), mounting hardware, instructions
UK Delivery & Support
UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and ADM's lifetime warranty.
Frequently Asked Questions
Which optic does it fit?
The Holosun AEMS family.
What does lower 1/3 co-witness mean?
The optic sits slightly higher than the irons, so they appear in the lower third of the window.
Does it return to zero?
Yes — the Auto Lock QD lever gives repeatable return-to-zero.
