Red dot adapters for FN models

This collection brings together every red dot adapter we have for FN models: optics ready plates for FN models with a factory optic cut, and red dot mounts for FN models without one. Pick your model above and you see only the plates or mounts that fit it.

Plate or mount: which one does your FN model take

• Optics Ready FN models have a factory optic cut in the slide, closed with a cover plate. They take an optics ready plate. The plate goes into the cut and connects it to the footprint of your red dot.
• FN models without an optic cut take a red dot mount. The mount replaces the rear sight in its dovetail. You need no slide milling and no permanent modifications.

A mount does not fit an Optics Ready model, and a plate does not fit a model without the cut. Choose your exact model, including the Optics Ready (OR) or MOS part of its name.

Optics Ready FN models

We have an optic plate for the FN 509 Optics Ready (OR). The plate goes into the factory optic cut and takes a red dot with the Shield RMSc footprint. It is made by Shield Sights.

Which red dots fit

The plate takes red dots with the Shield RMSc footprint. This footprint is common on compact pistol red dots. If your red dot uses another footprint, a footprint adapter may help. See Footprint adapters.

Installation

Remove the factory cover plate from the optic cut. Screw the optic plate into its place, then screw the red dot onto the plate. No milling is needed and you can do it yourself. Threadlocker on the screws is recommended.

FN models without an optic cut

We have red dot mounts for FN pistols without an optic cut. The mount replaces the rear sight, with no permanent modifications.

• FN 509: an Outer Impact type C mount, made of aluminium in the USA. It fits Trijicon RMR, C-More RTS and Docter footprints. See Red dot mounts for FN 509.
• FN Five-seveN: a Shield Sights mount in brass and polymer for the Shield RMSc footprint. See Red dot mounts for FN Five-seveN.

Installation

Drift the rear sight out of the dovetail with a sight pusher or a punch. Push the mount into the same dovetail and fix it. Then screw the red dot onto the mount. No slide milling or permanent modifications are needed. See Installation tools.

For the FN 509 Optics Ready, see Optics ready plates for FN models. For iron sights, see Sights for FN models.

Related collections

For iron sights, see Sights for FN models. For the tools you need, see Installation tools. For other brands, see Red dot adapters.

Frequently asked questions

Can I install an optic plate on my FN 509 at home?

Yes. No milling is needed, and you can do it yourself.

1. Remove the cover plate from the optic cut.
2. Screw the optic plate into the cut.
3. Screw the red dot onto the plate.

Put a drop of threadlocker on every screw.

Which red dots will fit my FN 509 Optics Ready?

Red dots with the Shield RMSc footprint, for example Shield red dots, the Holosun EPS Core or the Olight Osight K. The Shield Sights plate takes this footprint.

Does the plate fit a 509 without optic cut?

No. For a 509 without optic cut, use a red dot mount. See Red dot mounts for FN models.

Can I put a red dot on my FN without an optic cut?

Yes. The mount goes into the rear sight dovetail in place of the rear sight. No milling and no permanent changes, so you can put the rear sight back at any time.

Can I install the mount at home?

Yes, if you have a sight pusher or a punch.

1. Drift the rear sight out of the dovetail.
2. Push the mount into the dovetail and tighten it.
3. Screw the red dot onto the mount with a drop of threadlocker on each screw.

You find the tools in Installation tools.

My FN 509 is Optics Ready. Will these mounts fit?

No. A pistol with a factory optic cut takes an optic plate, not a mount. See Optics ready plates for FN models.