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What red dots fit the FN 509 MRD / Tactical?

Page last updated September 29, 2026. Data compiled September 2026 by Andrew Terrebonne.

62 of the 77 optics tracked here mount to this slide. This slide uses FN MRD plate system.

No plate neededPlate neededDoesn’t fit

Mount systemFN MRD plate system

Optics that fit62 of 77

Direct mount0

No plate to buy49

Plate to buy13

Plate to slideper plate instructions

No plate to buy counts the direct mounts plus the pairings whose plate normally comes in the pistol's or the optic's box. Box contents change between production runs, so check yours before counting on it.

New to red dots? What footprint, plate, co-witness and the rest mean

Cheapest ways to mount it

Cheapest overall$60–150Cyelee Cat / Wolfin-box plate: FN MRD → RMRBuild sheet

Cheapest enclosed emitter$175–360Viridian RFX45plate: FN MRD → ACRO / MPSBuild sheet

Same slide cutThe FN 509 Midsize MRD / Compact MRD, FN 509 LS Edge, FN 510 / 545 MRD and FN 509 CC Edge share this slide's optic cut (FN MRD plate system), so the optics, plates and screws below are the same for all of them. What differs between the models is under "On this model", where there is anything.

How this slide mounts an opticFN ships a four-plate kit with the MRD models.

Every optic, and how it mounts

Item	Footprint	How it mounts	Cost to mount
Plate in the box — 49
ADE Delta Pro Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$60–150
Ameriglo Haven Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$150–300
Burris FastFire 3 Build sheet	Docter / Noblex	in-box plate: FN MRD → Docter	$150–300
Burris FastFire 4 Build sheet	Docter / Noblex	in-box plate: FN MRD → Docter	$150–300
Bushnell RXS-100 Build sheet	Leupold DeltaPoint Pro	in-box plate: FN MRD → DeltaPoint Pro	$150–300
C&H Precision Comp Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$300–450
Crimson Trace CTS-1550 Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$150–300
Cyelee Cat / Wolf Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$60–150
EOTECH EFLX Mini Build sheet	Leupold DeltaPoint Pro	in-box plate: FN MRD → DeltaPoint Pro	$300–450
Holosun 407C X2 Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$150–300
Holosun 407COMP Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$300–450
Holosun 507-Promax Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$300–450
Holosun 507C X2 Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$300–450
Holosun 507C X3 / 407C X3 Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$300–450
Holosun 507COMP Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$300–450
Holosun 508T X2 Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$300–450
Holosun EPS-CORE EnclosedBuild sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$300–450
JP Enterprises JPoint Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$150–300
Leapers UTG OP3 Micro Build sheet	Docter / Noblex	in-box plate: FN MRD → Docter	$60–150
Leupold DeltaPoint Pro Build sheet	Leupold DeltaPoint Pro	in-box plate: FN MRD → DeltaPoint Pro	$300–450
Meopta MeoSight IV Build sheet	Docter / Noblex	in-box plate: FN MRD → Docter	$150–300
Meprolight MPO-DF Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$300–450
Noblex Sight III / Docter Sight C Build sheet	Docter / Noblex	in-box plate: FN MRD → Docter	$300–450
Olight Osight S Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$60–150
Primary Arms Classic 21 mm Micro Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$60–150
Riton 3 TACTIX MPRD 2 Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$150–300
Riton 3 TACTIX PRD Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$150–300
Shield Sights RMS2 Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$150–300
Shield Sights RMSc Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$150–300
SIG Sauer ROMEO-X Compact Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$150–300
SIG Sauer ROMEO-X Pro Build sheet	Leupold DeltaPoint Pro	in-box plate: FN MRD → DeltaPoint Pro	$300–450
SIG Sauer ROMEOZero Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$60–150
SIG Sauer ROMEOZero Elite Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$150–300
Sightmark Mini Shot A-Spec Build sheet	Docter / Noblex	in-box plate: FN MRD → Docter	$60–150
Springfield Armory Hex Dragonfly Build sheet	Docter / Noblex	in-box plate: FN MRD → Docter	$150–300
Springfield Armory Hex Wasp Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$150–300
Swampfox Justice II Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$150–300
Swampfox Liberty II Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$150–300
Swampfox Sentinel II Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$60–150
Trijicon RMR HD Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$650–900
Trijicon RMR Type 2 Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$450–650
Trijicon SRO Build sheet	Trijicon RMR	in-box plate: FN MRD → RMR	$450–650
Viridian RFX35 Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$60–150
Vortex Defender-CCW Build sheet	Shield RMSc	in-box plate: FN MRD → RMSc	$150–300
Vortex Defender-SL Build sheet	Leupold DeltaPoint Pro	in-box plate: FN MRD → DeltaPoint Pro	$150–300
Vortex Defender-ST Build sheet	Leupold DeltaPoint Pro	in-box plate: FN MRD → DeltaPoint Pro	$300–450
Vortex Defender-XL Build sheet	Leupold DeltaPoint Pro	in-box plate: FN MRD → DeltaPoint Pro	$300–450
Vortex Venom Build sheet	Docter / Noblex	in-box plate: FN MRD → Docter	$150–300
Vortex Viper Build sheet	Docter / Noblex	in-box plate: FN MRD → Docter	$150–300
Plate to buy — 13
Aimpoint ACRO C-2 EnclosedBuild sheet	Aimpoint ACRO	plate: FN MRD → ACRO / MPS	$475–710
Aimpoint ACRO P-1 EnclosedBuild sheet	Aimpoint ACRO	plate: FN MRD → ACRO / MPS	$475–710
Aimpoint ACRO P-2 EnclosedBuild sheet	Aimpoint ACRO	plate: FN MRD → ACRO / MPS	$675–960
Holosun 407K X2 Build sheet	Holosun K	plate: FN MRD → Holosun K / EPS	$175–360
Holosun 507K X2 Build sheet	Holosun K	plate: FN MRD → Holosun K / EPS	$325–510
Holosun 507K X3 / 407K X3 Build sheet	Holosun K	plate: FN MRD → Holosun K / EPS	$325–510
Holosun EPS EnclosedBuild sheet	Holosun K	plate: FN MRD → Holosun K / EPS	$325–510
Holosun EPS Carry EnclosedBuild sheet	Holosun K	plate: FN MRD → Holosun K / EPS	$325–510
Holosun SCS Carry EnclosedBuild sheet	Holosun K	plate: FN MRD → Holosun K / EPS	$325–510
Lucid Optics E7 EnclosedBuild sheet	Aimpoint ACRO	plate: FN MRD → ACRO / MPS	$175–360
Olight Osight K Build sheet	Holosun K	plate: FN MRD → Holosun K / EPS	$85–210
Steiner MPS EnclosedBuild sheet	Aimpoint ACRO	plate: FN MRD → ACRO / MPS	$475–710
Viridian RFX45 EnclosedBuild sheet	Aimpoint ACRO	plate: FN MRD → ACRO / MPS	$175–360
No fit — 15
ADE NUWAcc Pro	Trijicon RMRcc	no known route	—
Aimpoint COA Enclosed	Aimpoint COA / A-Cut	no known route	—
Aimpoint Micro T-2 Enclosed	Aimpoint Micro	no known route	—
C-More RTS2	C-More RTS2 / STS2	no known route	—
C-More STS2	C-More RTS2 / STS2	no known route	—
Holosun 509T Enclosed	Holosun 509T	no known route	—
Holosun SCS 320 Enclosed	Holosun SCS (320)	no known route	—
Holosun SCS MOS Enclosed	Holosun SCS (MOS)	no known route	—
SIG Sauer ROMEO-X Enclosed	SIG-LOC	no known route	—
SIG Sauer ROMEO-X SIG-LOC Compact Enclosed	SIG-LOC	no known route	—
SIG Sauer ROMEO-X SIG-LOC Pro Enclosed	SIG-LOC PRO	no known route	—
SIG Sauer ROMEO1PRO	SIG Romeo1Pro	no known route	—
SIG Sauer ROMEO2 Enclosed	SIG Romeo2	no known route	—
Trijicon RCR Enclosed	Trijicon RCR	no known route	—
Trijicon RMRcc	Trijicon RMRcc	no known route	—

Adapter plates for the FN 509 MRD / Tactical

Plate	Gives you	Source	Price
FN MRD → RMR	Trijicon RMR	FN factory ↗	in the box
FN MRD → Docter	Docter / Noblex	FN factory ↗	in the box
FN MRD → DeltaPoint Pro	Leupold DeltaPoint Pro	FN factory ↗	in the box
FN MRD → RMSc	Shield RMSc	FN factory	in the box
FN MRD → ACRO / MPS	Aimpoint ACRO	C&H Precision ↗	$25–60
FN MRD → Holosun K / EPS	Holosun K	C&H Precision ↗	$25–60

Plate

Gives you

Source

Price

FN MRD → RMR

Trijicon RMR

FN factory ↗

in the box

FN MRD → Docter

Docter / Noblex

FN factory ↗

in the box

FN MRD → DeltaPoint Pro

Leupold DeltaPoint Pro

FN factory ↗

in the box

FN MRD → RMSc

Shield RMSc

FN factory

in the box

FN MRD → ACRO / MPS

Aimpoint ACRO

C&H Precision ↗

$25–60

FN MRD → Holosun K / EPS

Holosun K

C&H Precision ↗

$25–60

Iron sights that co-witness

Typical co-witness by optic type; figures published for this slide are below, with their source.

Factory sights, per FNFN's own spec pages say the 509 MRD's 3-dot tritium sights co-witness with the optic, and that the 509 Tactical's suppressor-height night sights do too. FN — 509 MRD ↗ FN — 509 Tactical ↗

GuidesSuppressor-height sights: will your irons co-witness? · Installing a red dot: what the makers say

Check a specific pairing

Open the fit checker with this pistol selected, or click any "how it mounts" cell above for that pairing's verdict and build sheet.

Deciding between a few? Compare 3 popular optics on this slide side by side: window, weight, emitter, cost to mount and co-witness.

Something on this page wrong? Tell us what it should be, and include a source: nothing changes without one.