The Holosun 407/507K adapter plate for the FN 509 (part no. KPLT-FN509) mounts a Holosun 407K or 507K micro reflex sight to that pistol’s slide, built to handle hard-hitting recoil and rough field use. Holosun CNC machines the adapter from 6061 aircraft aluminum with a Type III hard anodized finish, giving it the durability demanded by law enforcement, military, and everyday shooters alike. Among FN 509-specific red dot mounts, this 407/507K adapter is a purpose-built accessory for that pistol platform.

Key Specifications

• This adapter fits the 407K and 507K micro reflex sights specifically.
• The fitment is the FN 509 pistol slide.
• The construction is 6061 aircraft aluminum with a Type III hard anodized finish.
• The adapter is built to withstand hard-hitting recoil and rough tactical use.

Frequently Asked Questions

Which optics does this adapter fit? The Holosun 407K and 507K micro reflex sights.

What finish protects this adapter? A Type III hard anodized finish over 6061 aircraft aluminum for durability.

Buy the Holosun 407/507K Adapter, FN 509

An FN 509 slide running a 407K or 507K gets a rugged, direct-fit adapter here. Order this adapter from our Lubbock, Texas gun shop and it ships fast.