American Defense Holosun 509T QR Low Mount
American Defense Mfg.
$107.69
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American Defense Mfg.
American Defense Holosun 509T QR Low Mount
The American Defense Mfg. AD-509T QR Low Mount is a precision-engineered quick-detach optic mount purpose-built for the Holosun 509T red dot sight, delivering rock-solid performance on AR pistols, SBRs, and a wide range of Picatinny-railed weapon platforms.
- Machined from aircraft-grade 6061-T6 aluminum for a lightweight, durable build
- Hard coat T3 Mil-Spec anodize finish resists corrosion, wear, and hard use
- Patented QD Auto Lock Lever returns to zero reliably after every removal
- Accommodates both in-spec and out-of-spec Picatinny rail systems with ease
- Tool-free adjustment using a finger or standard flat-blade screwdriver
- Lever configurable to lock facing forward or rearward for user preference
Who This Is For
This mount is ideal for competitive shooters, home defenders, and tactical operators running a Holosun 509T on an AR pistol or similarly configured platform who demand a no-compromise, repeatable quick-detach solution. If you need to transition between hosts or frequently swap optics without losing zero, the AD-509T QR Low is the mount to reach for.
Specifications
| Brand | American Defense Mfg. |
|---|---|
| Model | AD-509T QR Low |
| Compatible Optic | Holosun 509T |
| Material | 6061-T6 Aluminum |
| Finish | Hard Coat T3 Mil-Spec Anodize |
| Mount Height | Low |
| Attachment System | Patented QD Auto Lock Lever |
| Rail Compatibility | MIL-STD-1913 Picatinny |
| Tool Requirement | None (finger or flat-blade screwdriver) |
| Configuration | One-Piece |
| Country of Origin | USA |
Frequently Asked Questions
Will this mount work with any red dot other than the Holosun 509T?
The AD-509T QR Low is specifically designed and machined to interface with the Holosun 509T footprint. It is not a universal mount and will not accept optics with different footprints, such as the Trijicon RMR or Leupold DeltaPoint Pro. For best fit and function, use it exclusively with the Holosun 509T.
How reliable is the return-to-zero after removing and reattaching the optic?
American Defense Mfg. mounts are widely regarded for exceptional return-to-zero performance. The Patented QD Auto Lock Lever provides consistent clamping pressure and superior rail engagement each time the mount is reattached, making it trusted by competitive shooters and military users who cannot afford zero shift between sessions.
Is the "Low" mount height appropriate for use on an AR-15 or AR pistol with standard iron sights?
The low mount profile positions the Holosun 509T closer to the bore, which is well-suited for AR pistols and compact platforms where a lower optical axis improves cheek weld and sight picture. For co-witness with standard-height AR iron sights, you may prefer a lower-1/3 or absolute co-witness height — confirm your preferred sight height before ordering.
