Holosun 509 Adapter for FNX-45

Holosun 509 Adapter for FNX-45 is a pistol optic mounting accessory designed to provide a secure interface for installing 509-footprint red dot optics onto the FN FNX-45 slide. This adapter allows users to mount compatible enclosed or open 509-style optics without permanent modification to the host firearm.

Manufactured by Holosun, this adapter addresses the need for a reliable, repeatable mounting solution when pairing a 509-footprint optic with the FNX-45 platform. Its CNC-machined construction and hard-anodized finish are intended to maintain consistent optic alignment and durability through routine range use, training, and duty-style configurations.

Key Features

• Converts a 509 optic footprint to fit the FN FNX-45 slide

• Designed specifically for the FNX-45 platform (as stated by product data)

• CNC-machined construction for consistent fit and alignment

• 6061 aircraft-grade aluminum body

• Type III hard-anodized finish for enhanced wear resistance

• Black finish to match common slide and optic colors

• Passive, mechanical adapter with no power source required

Specifications & Construction

• Product Type: Optic adapter / mounting accessory

• Compatible Optic Footprint: Holosun 509 pattern

• Host Platform: FN FNX-45

• Material: 6061 aircraft-grade aluminum

• Manufacturing Method: CNC machined

• Finish: Type III hard anodized

• Color: Black

• Dimensions / Weight: Not specified in provided product data

The rigid aluminum construction and hard-anodized surface are intended to resist wear from recoil forces and repeated optic installation while preserving zero consistency.

Compatibility & Intended Use

This adapter is explicitly designed for the FN FNX-45 and is intended to mount 509-footprint red dot optics to that platform. It should only be used with optics that share the Holosun 509 mounting pattern.

Typical use cases include:

• Duty or service pistol configurations

• Range and training setups

• Optic-equipped FNX-45 handguns for general use

Users should confirm that their selected optic uses the 509 footprint before installation and follow recommended torque and mounting procedures.

What’s Included

• One (1) Holosun 509 Adapter for FNX-45

• Manufacturer packaging and documentation

The Holosun 509 Adapter for FNX-45 provides a straightforward, non-permanent solution for mounting 509-footprint optics on the FNX-45, supporting reliable optic integration for training, range, or duty-style pistol setups.