The Holosun KPLT-FN509 is a genuine Holosun adapter plate that carries a K footprint optic on FN 509 optics-ready slides using FN's MRD mounting system.
A plate is a small part with one job: make a slide cut in one pattern accept an optic machined in another. Get it wrong and nothing else on the pistol matters.
It is CNC machined from aircraft-grade aluminium with a hard-anodised finish, to Holosun's own tolerances rather than a third party's. The optic side is cut for the Holosun K footprint, the compact pattern Holosun uses on the 407K and 507K, and the slide side is shaped for the FN 509 MRD system.
This is the part to buy when a small K-series sight is going onto an FN 509 rather than a slide already milled for it. Two things worth knowing before you order: it will not take an RMR-footprint optic such as the 507C or 407C, and it will not take a 509T, which uses its own rear-lug pattern. Holosun does not state which screws are supplied with the plate, so plan on checking what arrives against the hardware already on your pistol.
Why shooters choose the KPLT-FN509
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Optic footprint — Holosun K, the pattern used by the 407K and 507K
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Host — FN 509 optics-ready slides using FN's MRD system
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Machining — CNC machined to Holosun's own tolerances
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Material — aircraft-grade aluminium with a hard-anodised finish
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Genuine part — a Holosun component, not an aftermarket copy
What the KPLT-FN509 fits
It fits FN 509 models built around FN's MRD optic-mounting system, and takes K footprint optics. For a Glock MOS host the KPLT-MOS9MM is the right plate, for a CZ P-10 C the KPLT-CZP10C, and if your optic is a 509T rather than a K-series it needs the 509PLT-FN509T instead.
Specifications
| Type |
Optic adapter plate |
| Optic footprint |
Holosun K (407K, 507K) |
| Host |
FN 509 MRD optics-ready slides |
| Material |
Aircraft-grade aluminium |
| Finish |
Hard anodised |
| Machining |
CNC machined |
| MPN |
KPLT-FN509 |
Match the plate to the slide and the footprint to the plate, and the rest of the fitting is four screws. Order the KPLT-FN509 today — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.
Explore more: RMSc Footprint Red Dot Sights, KPLT-507C or browse all Holosun
