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Red Dot Fit Checker

Confirm fit, find the correct mounting path, or compare compatible optics and decide which one best matches how you plan to use it.

58platforms and cuts
86named optics
207manufacturer-verified paths
17footprint families

Fit checker + buying decision

Choose the right red dot for your firearm

Already have an optic in mind? Verify whether it fits and see the exact plate or direct-mount path. Still deciding? Compare two or three optics and get a best-match recommendation for your priorities.

Manufacturer evidence · Jul 24, 2026
01Confirm fitKnow whether the exact optic and firearm have a documented route.02Find the mountSee the required direct cut, plate, adapter, and available hardware notes.03Choose confidentlyCompare verified options and get an evidence-based best match.

Start here: what do you need help with?

Your result: a documented fit verdict, the required mounting route, and the manufacturer evidence behind it.

01Choose your firearmSelect the exact optic-ready model, plate system, or slide cut.
02Choose a mounting pathLeave this automatic—or select a specific plate or cut you already have.
03Choose the red dotPick the exact optic to receive its fit verdict and mounting instructions.

Next: choose your exact firearm first. We will unlock and evaluate the mounting path from there.

Manufacturer-verifiedBoth interfaces are supported by first-party documentation.
Reported or incompleteUseful lead, but not enough evidence for a purchasing recommendation.
Not documentedNo responsible conclusion yet; this does not mean incompatible.
Documented exceptionA manufacturer source identifies a model-specific conflict.
Before installation

A compatible footprint does not determine screw length, torque, sealing plate, threadlocker, or iron-sight co-witness. Follow the pistol, plate, and optic manufacturers’ instructions for the exact hardware stack in your hands.

Browse the standards

Manufacturer-sourced footprint families

Each family shows its documented optics and every visible platform with a verified path. “Same footprint” still yields to model-specific exceptions in the checker above.

7 optics

Aimpoint ACRO interface

Footprint source

Clamp-style enclosed interface. Small, fully interchangeable family.

OpticEmitterEvidence
Aimpoint ACRO C-1EnclosedManufacturer
Aimpoint ACRO C-2EnclosedManufacturer
Aimpoint ACRO P-1EnclosedManufacturer
Aimpoint ACRO P-2EnclosedManufacturer
Burris FastFire EEnclosedManufacturer
Steiner MPSEnclosedManufacturer
Vector Optics Frenzy Plus 1x18x20EnclosedManufacturer

Verified platform paths: Beretta 90 Series RDO (92X / M9A4 / 92XI) · Staccato DPO optic-ready pistols · Staccato HD (HOST system) · Springfield 1911 DS Prodigy AOS · ACRO-interface direct-milled slide · SIG P320 M17/M18 commercial slide · H&K VP9 (optic-ready) · Beretta APX (optic-ready) · CZ Shadow 2 OR · Walther Q5 Match · RMR-cut slide (any pistol milled for Trijicon RMR) · Picatinny rail (rifle / PCC / shotgun) · Springfield Echelon (Variable Interface System) · Walther PDP Gen 2 optic cut · S&W M&P M2.0 Optics Ready (C.O.R.E. plates) · FN 509 / 510 / 545 MRD (Low-Profile Optics Mounting System) · CZ P-10 series OR (C/F/S)

14 optics

Docter/Noblex

Footprint source

Also sold as the 'FastFire footprint' or 'Venom footprint' — all the same standard.

OpticEmitterEvidence
Athlon Midas TSR1OpenManufacturer
Burris FastFire 2OpenManufacturer
Burris FastFire 3OpenManufacturer
Burris FastFire 4OpenManufacturer
Delta Optical MiniDot 3OpenManufacturer
Leica Tempus / Tempus 2OpenManufacturer
Meopta MeoSight IVOpenManufacturer
Noblex (Docter) Sight 2 PlusOpenManufacturer
Primary Arms SLx RS-10OpenManufacturer
Sightmark Mini Shot M-SpecOpenManufacturer
US Optics DRS 2.0OpenManufacturer
UTG OP3 MicroOpenManufacturer
Vortex VenomOpenManufacturer
Vortex ViperOpenManufacturer

Verified platform paths: FN Five-seveN MRD · Beretta 90 Series RDO (92X / M9A4 / 92XI) · Canik TP9 SFx · Canik SFx Rival / Rival-S · IWI Masada full-size optic ready · Shadow Systems MR/DR/XR optic-ready models · Docter/Noblex-cut slide · H&K VP9 (optic-ready) · Beretta APX (optic-ready) · CZ Shadow 2 OR · Picatinny rail (rifle / PCC / shotgun) · Burris AR-F3 mount (AR flattop, co-witness height) · Glock MOS — standard Gen4/Gen5 (G17/19/45/47 MOS) · Springfield Echelon (Variable Interface System) · Springfield XD-M / XD-M Elite OSP · Walther PDP Gen 2 optic cut · Walther PDP Gen 1 optic cut · S&W M&P M2.0 Optics Ready (C.O.R.E. plates) · Taurus G3 / G3c T.O.R.O. · FN 502 Tactical · FN 309 MRD · FN 509 / 510 / 545 MRD (Low-Profile Optics Mounting System) · CZ P-10 series OR (C/F/S)

18 optics

Shield RMSc

Footprint source

The slimline standard used by micro-compact optic-ready pistols.

OpticEmitterEvidence
Burris FastFire COpenManufacturer
Canik MECANIK MO1OpenManufacturer
Canik MECANIK MO4EnclosedManufacturer
Crimson Trace RAD Micro ProOpenManufacturer
Meprolight MPO PRO-SEnclosedManufacturer
Meprolight MPO-SOpenManufacturer
Shield RMS (original Reflex Mini Sight)OpenManufacturer
Shield RMS2OpenManufacturer
Shield RMScOpenManufacturer
SIG ROMEO-X CompactOpenManufacturer
SIG ROMEO-X Compact EnclosedEnclosedManufacturer
SIG RomeoZero / RomeoZero EliteOpenManufacturer
Steiner MPS-CEnclosedManufacturer
Swampfox SentinelOpenManufacturer
Swampfox Sentinel IIOpenManufacturer
Viridian RFX11 Hellcat ExclusiveOpenManufacturer
Vortex Defender-CCWOpenManufacturer
Vortex Defender-CCW Enclosed SolarEnclosedManufacturer

Verified platform paths: H&K CC9 · H&K VP9CC optic-ready · FN Reflex MRD · Canik TP9 SFx · Canik SFx Rival / Rival-S · Canik METE MC9 / MC9L / MC9LS · Canik METE MC9 Prime · Springfield 1911 DS Prodigy AOS · IWI Masada Slim · CZ P-09 Nocturne (C / F) · Mossberg MC2sc / MC2c optic ready · H&K VP9 (optic-ready) · CZ Shadow 2 OR · RMSc-cut slimline slide (Hellcat / P365-class) · Glock Slimline MOS (G43X/G48 MOS) · Glock Slimline MOS-K (G43X/G48 MOSK) · Springfield Echelon (Variable Interface System) · Springfield Hellcat OSP / Hellcat Pro · Springfield XD-M / XD-M Elite OSP · Walther PDP Gen 2 optic cut · Walther PDP Gen 1 optic cut · S&W M&P M2.0 Optics Ready (C.O.R.E. plates) · S&W Shield Plus Optics Ready · S&W Equalizer (and CSX-E / Shield X group) · Ruger MAX-9 (optic-ready models) · Ruger RXM (multi-footprint pin cut) · Taurus GX4 T.O.R.O. · SIG P365 COMPACT / Shield RMSc cut (optic-ready) · SIG P365X / P365-XL COMPACT cut · SIG P365 SIG-LOC Compact cut · FN 502 Tactical · FN 309 MRD · CZ P-10 series OR (C/F/S)

17 optics

Trijicon RMR

Footprint source

The most common US slide cut. Not directly compatible with ACRO or Docter optics — adapters exist.

OpticEmitterEvidence
Bushnell RXM-300OpenManufacturer
Holosun 407C (X2)OpenManufacturer
Holosun 407C X3OpenManufacturer
Holosun 407COMPOpenManufacturer
Holosun 507C (X2)OpenManufacturer
Holosun 507C X3OpenManufacturer
Holosun 507COMPOpenManufacturer
Holosun 508T (X2)OpenManufacturer
Meprolight MPO PRO-FEnclosedManufacturer
Meprolight MPO-FOpenManufacturer
Primary Arms SLx RS-10ROpenManufacturer
Swampfox Justice IIOpenManufacturer
Swampfox Liberty IIOpenManufacturer
Trijicon RCREnclosedManufacturer
Trijicon RMR (Type 2)OpenManufacturer
Trijicon RMR HDOpenManufacturer
Trijicon SROOpenManufacturer

Verified platform paths: FN Five-seveN MRD · Beretta 90 Series RDO (92X / M9A4 / 92XI) · Canik TP9 SFx · Canik SFx Rival / Rival-S · Staccato DPO optic-ready pistols · Staccato HD (HOST system) · Springfield 1911 DS Prodigy AOS · IWI Masada full-size optic ready · Shadow Systems MR/DR/XR optic-ready models · H&K VP9 (optic-ready) · Beretta APX (optic-ready) · CZ Shadow 2 OR · RMR-cut slide (any pistol milled for Trijicon RMR) · Glock MOS — standard Gen4/Gen5 (G17/19/45/47 MOS) · Glock Gen6 Optic Ready · Springfield Echelon (Variable Interface System) · Springfield XD-M / XD-M Elite OSP · Walther PDP Gen 2 optic cut · Walther PDP Gen 1 optic cut · S&W M&P M2.0 Optics Ready (C.O.R.E. plates) · Ruger RXM (multi-footprint pin cut) · Taurus G3 / G3c T.O.R.O. · SIG P320 Pro-Cut slide · FN 502 Tactical · FN 509 / 510 / 545 MRD (Low-Profile Optics Mounting System) · CZ P-10 series OR (C/F/S)

7 optics

Leupold DeltaPoint Pro

Footprint source

Its own standard. Physically sits on Shield mounts but does NOT lock securely (4.2mm vs 3.8mm sockets) — never mix them.

OpticEmitterEvidence
Bushnell RXS-250OpenManufacturer
EOTECH EFLXOpenManufacturer
Leupold DeltaPoint ProOpenManufacturer
SIG ROMEO-X ProOpenManufacturer
Vortex Defender-STOpenManufacturer
Vortex Defender-XLOpenManufacturer
Vortex Venom EnclosedEnclosedManufacturer

Verified platform paths: FN Five-seveN MRD · Beretta 90 Series RDO (92X / M9A4 / 92XI) · Canik TP9 SFx · Canik SFx Rival / Rival-S · Staccato DPO optic-ready pistols · Staccato HD (HOST system) · Springfield 1911 DS Prodigy AOS · IWI Masada full-size optic ready · Shadow Systems MR/DR/XR optic-ready models · DeltaPoint Pro-cut slide · SIG P320 M17/M18 commercial slide · H&K VP9 (optic-ready) · Beretta APX (optic-ready) · Glock MOS — standard Gen4/Gen5 (G17/19/45/47 MOS) · Glock Gen6 Optic Ready · Springfield Echelon (Variable Interface System) · Springfield XD-M / XD-M Elite OSP · Walther PDP Gen 2 optic cut · Walther PDP Gen 1 optic cut · S&W M&P M2.0 Optics Ready (C.O.R.E. plates) · Ruger RXM (multi-footprint pin cut) · Taurus G3 / G3c T.O.R.O. · SIG P320 Pro-Cut slide · FN 309 MRD · FN 509 / 510 / 545 MRD (Low-Profile Optics Mounting System) · CZ P-10 series OR (C/F/S)

4 optics

Holosun K

Footprint source

A modification of the Shield RMS/SMS standard — K optics lack rear sockets and have shallower front sockets. NOT identical to RMSc; some cuts take both, some don't.

OpticEmitterEvidence
Holosun 407K (X2)OpenManufacturer
Holosun 507K (X2)OpenManufacturer
Holosun EPS (full size)EnclosedManufacturer
Holosun EPS CarryEnclosedManufacturer

Verified platform paths: H&K CC9 · H&K VP9CC optic-ready · FN Reflex MRD · Springfield 1911 DS Prodigy AOS · IWI Masada Slim · CZ P-09 Nocturne (C / F) · Glock MOS — standard Gen4/Gen5 (G17/19/45/47 MOS) · Glock Slimline MOS (G43X/G48 MOS) · Glock Slimline MOS-K (G43X/G48 MOSK) · Springfield Echelon (Variable Interface System) · Springfield Hellcat OSP / Hellcat Pro · Springfield XD-M / XD-M Elite OSP · Walther PDP Gen 2 optic cut · S&W M&P M2.0 Optics Ready (C.O.R.E. plates) · S&W Shield Plus Optics Ready · S&W Equalizer (and CSX-E / Shield X group) · Ruger MAX-9 (optic-ready models) · Taurus GX4 T.O.R.O. · SIG P365X / P365-XL COMPACT cut · FN 309 MRD · CZ P-10 series OR (C/F/S)

1 optics

Walther PDP 2.0 dedicated direct mount

Footprint source

Model-specific interface for the Holosun SCS-PDP-GR on Walther PDP 2.0 slides. It is not a generic footprint family.

OpticEmitterEvidence
Holosun SCS-PDP-GROpenManufacturer

Verified platform paths: Walther PDP Gen 2 optic cut

1 optics

S&W M&P M2.0 dedicated direct mount

Footprint source

Model-specific interface for the Holosun SCS-MP2-GR on optics-ready M&P M2.0 Full Size and Compact slides. It is not a generic footprint family.

OpticEmitterEvidence
Holosun SCS-MP2-GROpenManufacturer

Verified platform paths: S&W M&P M2.0 Optics Ready (C.O.R.E. plates)

1 optics

CZ P-10 OR dedicated direct mount

Footprint source

A model-specific interface for the Holosun SCS-P10-GR. Treat it as an exact optic-to-slide assignment, not as an interchangeable footprint family.

OpticEmitterEvidence
Holosun SCS-P10-GROpenManufacturer

Verified platform paths: CZ P-10 series OR (C/F/S)

6 optics

C-More STS/RTS

Footprint source

Competition-optic standard (C-More STS2/RTS2; several makers group Vortex Razor and SIG Romeo3 here).

OpticEmitterEvidence
C-More RTS2OpenManufacturer
C-More RTS3BOpenManufacturer
C-More STS2OpenManufacturer
SIG ROMEO3 MAXOpenManufacturer
SIG ROMEO3 XLOpenManufacturer
Vortex Razor Red DotOpenManufacturer

Verified platform paths: Beretta 90 Series RDO (92X / M9A4 / 92XI) · Canik TP9 SFx · Canik SFx Rival / Rival-S · H&K VP9 (optic-ready) · Beretta APX (optic-ready) · Glock MOS — standard Gen4/Gen5 (G17/19/45/47 MOS) · Glock Gen6 Optic Ready · S&W M&P M2.0 Optics Ready (C.O.R.E. plates) · Taurus G3 / G3c T.O.R.O. · FN 509 / 510 / 545 MRD (Low-Profile Optics Mounting System) · CZ P-10 series OR (C/F/S)

3 optics

SIG Sauer PRO

Footprint source

SIG's proprietary pattern for Romeo1Pro/Romeo2. DPP-derived, but SIG warns it will not fit all DeltaPoint Pro footprints due to recoil-boss variance.

OpticEmitterEvidence
SIG ROMEO-X Pro EnclosedEnclosedManufacturer
SIG Romeo1 ProOpenManufacturer
SIG Romeo2OpenManufacturer

Verified platform paths: SIG P320 M17/M18 commercial slide · Springfield Echelon (Variable Interface System) · S&W M&P M2.0 Optics Ready (C.O.R.E. plates) · SIG P320 Pro-Cut slide

1 optics

SIG-LOC Compact

Footprint source

SIG's newer Leverage Optimized Connection mount; SIG-LOC slides remain backward-compatible with Shield RMSc optics.

OpticEmitterEvidence
SIG ROMEO-X SIG-LOC CompactEnclosedManufacturer

Verified platform paths: SIG P365 SIG-LOC Compact cut

1 optics

SIG-LOC MHS

Footprint source

The single-screw military M17/M18 interface used by the ROMEO-M17. It is not the same cut as commercial P320 PRO or DeltaPoint Pro slides.

OpticEmitterEvidence
SIG ROMEO-M17EnclosedManufacturer

Verified platform paths: SIG M17/M18 military-issue or commemorative MHS slide

1 optics

Trijicon RMRcc

Footprint source

Trijicon's narrower concealed-carry pattern. It is proprietary and does not directly fit standard RMR or RMSc cuts without a model-specific adapter.

OpticEmitterEvidence
Trijicon RMRccOpenManufacturer

Verified platform paths: H&K VP9CC optic-ready · RMRcc-cut slide (any pistol milled for Trijicon RMRcc)

1 optics

Aimpoint COA / A-CUT

Footprint source

Aimpoint's proprietary plate-free wedge interface. It is not an RMR, DPP, RMSc, or ACRO cut; use only on a firearm model explicitly marked A-CUT.

OpticEmitterEvidence
Aimpoint COAEnclosedManufacturer

Verified platform paths: Glock Aimpoint A-CUT (COA models) · Ruger RXM A-CUT (models 19461–19466)

2 optics

Holosun 509T

Footprint source

The enclosed 509T's own pattern — excluded even from Glock's Holosun plate groups; hosts need a dedicated 509T plate.

OpticEmitterEvidence
Holosun 509T X2EnclosedManufacturer
Holosun AEMS MacroEnclosedManufacturer

Verified platform paths: Staccato DPO optic-ready pistols · Springfield 1911 DS Prodigy AOS · Holosun 509T direct-milled slide · H&K VP9 (optic-ready) · Walther PDP Gen 2 optic cut · S&W M&P M2.0 Optics Ready (C.O.R.E. plates) · CZ P-10 series OR (C/F/S)

1 optics

FN PUREVIEW proprietary interface

Footprint source

FN's proprietary native interface for the PUREVIEW optic on named FN MRD, Tactical, and Edge pistol models. It is not a generic footprint family.

OpticEmitterEvidence
FN PUREVIEWEnclosedManufacturer

Verified platform paths: FN Five-seveN MRD · FN 509 / 510 / 545 MRD (Low-Profile Optics Mounting System)

Evidence standard

How a path becomes verified

A green pairing requires a manufacturer source for the mounting path and the optic’s declared interface, unless the platform maker names that exact optic. Model-specific conflicts override nominal footprint matches.

Retail listings, Q&A, and owner reviews are monitored as field reports. They help us find missing screws, plate revisions, clearance problems, and mislabeled generations—but they never create a green result on their own.

Spot an error or a missing path? Send the exact model and source; compatibility corrections get priority.

Important distinction

Unknown is different from incompatible.

A blue result means the combination is not documented in this database yet. Red is reserved for a model-specific conflict supported by published evidence. Neither result invites machining, improvised screws, or forcing a plate that appears close.

Common fit questions

Frequently asked questions

How do I know which footprint my pistol slide is cut for?

Check the pistol manufacturer's optic-ready documentation — plate-system pistols list which footprint each numbered plate supports, while direct-milled slides name their cut. Never guess from photos: several footprints look alike but differ in screw spacing, socket depth, and recoil-boss geometry.

Can I put an ACRO-footprint optic on an RMR-cut slide?

Yes, with a verified RMR-to-ACRO adapter. The tradeoff is added height, which can move the optic above your iron sights. A direct plate made for the pistol and optic footprint is the cleaner route when one exists.

What does a manufacturer-verified result mean?

A green result means first-party documentation supports the platform's mounting route and the optic's interface, or the platform maker names that exact optic model. It is strong purchasing evidence for the plate-and-footprint combination, but you must still confirm the exact firearm generation, optic SKU, plate SKU, and installation hardware.

Can I rely on a green result when buying an optic or plate?

Use a green result to identify the documented optic, plate, and slide combination. Before ordering, compare the linked manufacturer pages with the exact model numbers in your cart. Product revisions, regional SKUs, and included hardware can change without changing the footprint name.

What does Compare on My Firearm evaluate?

It evaluates each optic against the exact selected host, then compares manufacturer-published attributes for your chosen priority: everyday carry, all-weather reliability, fast defensive pickup, precision, or low maintenance. Every column shows the fit verdict, mounting path, specifications, hardware notes, and linked evidence. A best-match recommendation appears only when the viable options have enough first-party data; retail price, owner reviews, and unsupported durability claims are not scored.

Does a compatible footprint guarantee the supplied screws will work?

No. Footprint compatibility does not determine screw thread, length, torque, sealing plate, or threadlocker instructions. Use the hardware specified by the firearm or plate manufacturer, confirm the screws do not bottom out or contact internal parts, and have the assembled firearm checked before live fire.

Should I file recoil lugs, shorten screws, or modify a plate to make an optic fit?

Not unless the exact firearm, plate, or optic manufacturer explicitly authorizes that modification for the products in your hands. Retailer answers and owner reports sometimes describe filing lugs or shortening hardware, but the Fit Checker treats those as research leads—not installation instructions—and will instead show the route as incomplete or unsupported.

What is the installation plan shown with some fit results?

It turns an exact verified host-and-optic route into an evidence-backed component list, hardware summary, clearance warnings, unresolved fields, and pre-install checklist. A route can be verified while installation details remain incomplete; the plan labels that distinction and never copies missing screw or torque facts from a similar footprint.

What does “not documented” mean in the fit checker?

It means the database does not have enough manufacturer evidence to recommend a mounting path. It does not mean the combination is physically impossible. The tool reserves a red result for a model-specific conflict supported by published evidence.

Can retailer listings or customer reviews create a verified result?

No. Retailer listings, Q&A pages, and owner reviews are useful for finding possible screw, clearance, or model-revision problems, but they cannot create a green result. Optics Intel uses them as research leads and requires first-party documentation for manufacturer-verified guidance.

Do same-footprint optics always interchange?

Not always. A screw pattern can match while the optic body collides with a fitted mount, and RMSc, Holosun K, DPP, and SIG-derived cuts contain important dimensional variations. The tool applies model-specific exceptions after checking the nominal footprint.

How do I tell which optic cut a SIG P365 has?

First confirm the slide is factory optic-ready. SIG's current P365 manual says raised bosses under the filler plate identify the COMPACT/Shield RMS-c cut, while flush screw holes identify SIG-LOC. Choose the matching checker host; the P365, XL, XMacro, FUSE, or AXG family name alone is not enough.

Does a Holosun 507K direct fit a Springfield Hellcat Pro?

No on the unmodified factory Springfield Micro cut. The Hellcat Pro has a four-boss RMSc-pattern host, while the 507K uses Holosun K geometry. Choose a verified Hellcat-Pro-specific RMSc-to-K plate and confirm its M4 hardware against Springfield's maximum 0.095-inch / 2.4-mm screw protrusion.

Why does the checker reject ROMEOZero on a Hellcat if both say RMSc?

SIG explicitly advises against mounting ROMEOZero on Springfield Hellcat pistols because the design does not provide sufficient screw-thread engagement. This exact model warning overrides the nominal footprint match.

How current is the Red Dot Fit Checker, and how can I report a problem?

The evidence badge shows the database's latest review date, and each verified result links to its manufacturer sources. If a real installation disagrees with the checker, use “Report a fit problem” in the result to email the exact platform, optic, and displayed mounting path to [email protected].