Holosun 407/507K Adapter for FN 509

The Holosun 407/507K Adapter for FN 509 provides a secure, purpose-built mounting solution for Holosun 407 and 507K optics on FN 509 pistols. CNC machined from 6061 aircraft-grade aluminum and finished with a Type III hard-anodized coating, the adapter resists corrosion and wear encountered in regular use. The design preserves optic alignment and offers a low-profile footprint compatible with the FN 509 optic pattern. It is suitable for both professional users and civilian shooters who require a durable mounting interface.

Key Specifications

• The finish is Black.
• Designed to fit the FN 509 optic footprint.
• Model designation: 407/507K Adapter.
• Product type is listed as Adaptor.
• Intended category: Mounting Accessories.
• CNC-machined from 6061 aircraft aluminum with a Type III hard-anodized finish.
• Compatible with Holosun 407 and 507K red dot models.
• Engineered to maintain optic alignment under repeated use.

Cleanly engineered with proven materials and a serviceable finish, this adapter provides a reliable, low-profile solution for mounting Holosun 407/507K sights to FN 509 pistols. Its straightforward fitment and durable construction make it a practical upgrade for operators and recreational shooters seeking a rugged mounting option without unnecessary complexity.