American Defense Mfg Holosun 509T Co-Witness Mount
American Defense Mfg.
$113.69
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American Defense Mfg.
American Defense Mfg Holosun 509T Co-Witness Mount
The American Defense Mfg. AD-509T QD Co-Witness Mount is a precision-engineered quick-detach mounting solution designed specifically for the Holosun 509T red dot sight, delivering rock-solid performance on AR pistols, carbines, and other Picatinny-railed platforms.
- Machined from lightweight 6061-T6 aluminum with Mil-Spec hard coat anodize finish
- Patented QD Auto Lock Lever ensures fast, repeatable on/off deployment
- Accommodates both in-spec and out-of-spec Picatinny rail systems reliably
- Tool-free adjustment operable with a finger or standard flat-blade screwdriver
- Lever configures to lock facing forward or rearward to suit your preference
- Superior clamping surface maximizes rail engagement for zero-retention integrity
Who This Is For
This mount is purpose-built for AR pistol builders, competition shooters, and tactical operators who run the Holosun 509T and need a lightweight, no-compromise quick-detach solution. It's equally at home on duty carbines and range builds where repeatable zero and rapid optic swaps are non-negotiable priorities.
Specifications
| Brand | American Defense Mfg. |
|---|---|
| Model | AD-509T QD Co-Witness Mount |
| Compatible Optic | Holosun 509T Red Dot |
| Material | 6061-T6 Aluminum |
| Finish | Hard Coat T3 Mil-Spec Anodize |
| Mount Type | Quick-Detach (QD) One-Piece |
| Rail Compatibility | Picatinny / MIL-STD-1913 |
| Co-Witness Height | Absolute / Lower 1/3 (model dependent) |
| Lever Configuration | Forward or Rearward Lock |
| Tool Requirement | None (finger or flat-blade screwdriver) |
| Country of Origin | USA |
Frequently Asked Questions
Will this mount work on both AR pistols and full-length carbines?
Yes. The AD-509T QD mount is designed to function on any platform with a standard Picatinny (MIL-STD-1913) rail, making it compatible with AR pistols, carbines, and other long guns. The Auto Lock Lever system is specifically engineered to handle both in-spec and out-of-spec rail systems, so minor rail variations won't compromise clamping force or zero retention.
Does this mount return to zero after being removed and reinstalled?
American Defense Mfg. mounts are renowned for their repeatable zero performance. The patented QD Auto Lock Lever provides consistent clamping tension each time the mount is secured, allowing shooters to remove and reinstall the optic without losing their zero — a critical feature for any serious tactical or competition application.
Is the Holosun 509T optic included with this mount?
No, the Holosun 509T red dot sight is sold separately. This listing is for the American Defense Mfg. AD-509T QD mount only, which is designed to accept and securely hold the 509T footprint. Be sure to verify the co-witness height option (absolute or lower 1/3) matches your iron sight setup before purchasing.
