Home / Pistols / GLOCK 43X MOS / Holosun 509T

Does the Holosun 509T fit the GLOCK 43X MOS?

No: the slide is not cut for the Holosun 509T footprint, and no plate listed here bridges it.

No known fit

Enclosed emitter

Nothing in this database bridges the GLOCK Slimline MOS (43X / 48) interface to the Holosun 509T pattern. Its own world. Almost always mounted on a dedicated 509T plate; steel plates are the common recommendation. A custom plate or a re-mill would be the only route — check with a plate maker before assuming it can't be done.

SlideGLOCK Slimline MOS (43X / 48)

Optic footprintHolosun 509T

Slide is cut forShield RMSc, Holosun K

Plates made for itnone

How this slide mounts an opticMilled for the RMSc pattern with M4 screws — no plate, and no plate is available. Holosun K optics bolt on and simply leave the rear posts unused.

About this opticTitanium; duty-oriented. Steel plates recommended.

What fits the GLOCK 43X MOS instead

22 of the 75 optics tracked here mount to it. The cheapest ways in:

Cheapest overall$60–150SIG Sauer ROMEOZerodirect — no adapterBuild sheet →

Cheapest with no plate$60–150SIG Sauer ROMEOZerodirect — no adapterBuild sheet →

Cheapest enclosed emitter$300–450Holosun EPS-COREdirect — no adapterBuild sheet →

And the optics asked about most that do fit it:

All 22 optics that fit it →

Where the Holosun 509T does go

It mounts to 48 of the 178 pistols tracked here. The ones asked about most:

All 48 pistols it fits →

Something on this page wrong? Say what it should be. Corrections from someone who owns the pistol are why this is worth more than a spec sheet — and nothing here changes without a source, so bring one.