Holosun 509T Optic Plate Adapter - FN 509T
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Product description
Put a 509T on Your 509T for a 509T Combo
The Holosun 509T Optic Plate Adapter is the perfect solution to put a Holosun 509T on your 509T to have two 509Ts. This part helps you not stack adapter plate on adapter plate like a Jenga tower by giving the 509T a simple and low-profile way to mount directly to your FN 509T pistol. When it comes to reliability and performance, settle for nothing less.
Seamless Compatibility
Converts the Glock MOS footprint on your slide to securely mount the Holosun 509T and SCRS red dot. The SCRS is meant for rifles so it will sit a little higher and not a flush as the 509T but it can be used. The SCRS may also not work in conjunction with certain rear sights.
Strong and Secure Adapter
The plate and screws are made from 6061 T6 Aluminum to avoid issues such as bending, warping, or breaking that other adapter plates that use weaker metal can have. Additionally, this adapter plate has been tested to withstand rigorous use and heavy recoil, ensuring your optic stays secure and zeroed.
Low-Profile Design
Maintaining a thin and unobtrusive profile keeps your firearm looking good and doesn’t raise your optic as high as other optic plates.
Long Term Durability
It provides a rock-solid connection between the optic and slide, preserving your zero for consistent accuracy. The enclosed design of the 509T, combined with this adapter, ensures unparalleled reliability by protecting the red dot emitter from dirt, dust, and debris—ideal for tactical, competitive, and defensive shooting.
Simple Installation
Comes with all the necessary hardware, allowing a straightforward installation to easily and securely mount your optic without compromising performance or needing to take your firearm to a gunsmith.
Compatibility
- FN 509T/ 509 Tactical
- Holosun 509T and Holosun SCRS Red Dots
NOTE: This plate DOES NOT fit the 509T ACSS Vulcan
Benefits of Switching to the Holosun Holosun or SCRS
- Enclosed emitter design to keep out dirt, snow, and other debris
- All models of the 509T and SCRS also have a solar-powered failsafe to ensure you can always use it, even if the battery is dead.
- The ability to change batteries without removing the optic means you don’t have to re-zero every time the battery is changed, unlike the Trijicon RMR
Specifications
- Brand: Holosun
- Model: 509T Optic Plate Adapter – FN 509T
- MPN: HS509PLT-MOS9MM
- Fit:
- Firearm Slide Mount – FN 509T
- Optic – Holosun 509T and SCRS models
- Material: 6061 T6 Aluminum
- Finish: Type III Hard Anodized Finish
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Questions & Answers
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Warranty & returns
90-day no-hassle returns
The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.
If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.







