Optics Adapter Plate – FN 509/510/545 V4 MIL/LEO to Holosun 509T

Mounting a modern optic on your FN 509, 510, or 545 V4 requires the right adapter plate. This C&H Precision optics adapter plate bridges your MIL/LEO-spec pistol to Holosun 509T red dots with precision engineering. Whether you're picking up a transfer at our FFL transfer in Sunnyvale or upgrading an existing platform, proper mounting ensures zero reliability.

Holosun 509T mounting for FN pistols

The adapter plate eliminates guesswork when installing a Holosun 509T on FN 509, 510, or 545 V4 MIL/LEO variants. C&H Precision engineered this mount to maintain zero integrity across repeated installation cycles. The plate interfaces directly with factory-cut slide patterns, ensuring consistent optical alignment. Shooters managing pistol transitions or upgrading sighting systems benefit from solid mechanical fit. For California buyers navigating state regulations, our California gun-buyer FAQ covers optics and accessory rules clearly. Visit our firearms dealer in Sunnyvale for our full catalog.

Frequently asked questions

Will this adapter plate fit all FN 509 variants?

This plate is engineered for FN 509, 510, and 545 V4 MIL/LEO models. Verify your exact slide variant before ordering. Earlier generation FN pistols use different optics cuts and require different mounting solutions.

Does the Holosun 509T come included with this adapter?

No. This is the adapter plate only. You'll need to source the Holosun 509T red dot separately. The plate provides the interface between your FN slide and the optic.

How much does an FFL transfer cost in Sunnyvale?

See our pricing and fees page for current FFL transfer rates — TacticCAL keeps fees flat and transparent. TacticCAL is your FFL dealer Mountain View in the Bay Area.