The Holosun 407/507K Adapter for FN 509, Black is a mounting accessory that fits FN 509.
The KPLT-FN509 Adapter Plate allows compact Holosun K-series optics such as the 407K and 507K to mount on FN 509 pistols with factory optic interfaces.
Its precision-machined aluminum construction and anodized finish provide a secure, low-profile mounting solution built for duty, carry, and range use.
How It Compares
Also compare the 509 Adapter for FN 509, 509 Adapter for Picatinny, Low Mount and 509 Adapter for Picatinny, Lower 1/3 Mount. Browse all optics Accessories and the full Holosun range. New to this? Read our guide: Caring for Your Optics: Cleaning and Off-Season Storage.
Ideal For
- FN 509 pistols with a factory optic interface
- Running a compact Holosun 407K or 507K on an FN 509 slide
- Duty, carry and range pistols that need a low-profile K-series plate
Key Features
Key Features
- FN 509 Optics Adapter Plate Allows Holosun 407K and 507K series optics to mount securely to FN 509 optics-ready pistol slides.
- K-Series Optic Compatibility Designed to adapt Holosun 407K and 507K footprint optics to FN 509 platform handguns.
- Precision Machined Construction Manufactured from durable aluminum to ensure proper optic alignment and reliable mounting stability.
- Secure Mounting Interface Engineered to maintain zero through recoil and extended shooting use.
- Low Profile Adapter Design Positions the optic close to the slide to preserve a natural sight picture and consistent draw.
- Hard Anodized Finish Protective surface treatment improves resistance to wear, corrosion, and harsh environments.
- Improved Platform Versatility Expands optic compatibility options for FN 509 owners using compact pistol optics.
- Lightweight Construction Minimal added weight maintains the balance and handling characteristics of the firearm.
- Holosun Fitment Precision Designed specifically for Holosun K footprint optics to ensure a precise and secure fit.
- Range and Carry Ready Ideal for shooters who want to equip their FN 509 with compact, high-performance pistol optics.
- Compatible with FN 509 Optic Cut Slides
- 6061 aircraft aluminum construction
- Corrosion-resistant anodized finish
Compatibility & Fitment
Fits FN 509. Not sure it fits? Contact us before you order and we will check for you.
Technical Specifications
Brand | Holosun |
Type | Mounting Accessory |
Model | 407/507K Adapter |
Color | Black |
MPN | KPLT-FN509 |
UPC | 810047071112 |
US Shipping & Support
Genuine Holosun, brand new and covered by the manufacturer's warranty. Shipping is free on US orders of $99 or more, and smaller orders ship from $6.95. Questions about fit, mounting or which option suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
What does the 407/507K Adapter fit?
Fits FN 509.
Is this a genuine Holosun product?
Yes. It is a new, genuine Holosun product sourced through an authorized US distributor.
How much is shipping?
Shipping is free on US orders of $99 or more. Orders under $99 ship at a flat rate from $6.95 to $9.95, depending on the order total.
