Red Dot Compatibility Tool: Which Optic Fits Which Pistol?
Red dot mounting comes down to matching two things: the footprint machined into the optic's base, and what your slide, plate system, or mount accepts. Pick both below — the tool returns the exact plate or adapter that connects them, with the source we verified it against. No guessed answers: unverified combinations say so.
The Footprint Families (Verified)
Everything the tool knows, browsable — each optic and pairing links its source.
Aimpoint ACRO interface
Clamp-style enclosed interface. Small, fully interchangeable family. Footprint reference
| Optic on this footprint | Type | Source |
|---|---|---|
| Steiner MPS | Enclosed emitter | verified |
| Aimpoint ACRO P-2 | Enclosed emitter | verified |
| Aimpoint ACRO P-1 | Enclosed emitter | verified |
| Aimpoint ACRO C-1 | Enclosed emitter | verified |
| Aimpoint ACRO C-2 | Enclosed emitter | verified |
| Vector Optics Frenzy Plus 1x18x20 | Enclosed emitter | verified |
Verified ways to mount this footprint: Glock MOS (any MOS model) · S&W M&P (CORE / optic-ready) · SIG P320 M17/M18 · 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 (check cut generation!) · FN 509 / 510 / 545 MRD (Low-Profile Optics Mounting System) · CZ P-10 series OR (C/F/S)
Docter/Noblex
Also sold as the 'FastFire footprint' or 'Venom footprint' — all the same standard. Footprint reference
| Optic on this footprint | Type | Source |
|---|---|---|
| Burris FastFire 2 | Open emitter | verified |
| Burris FastFire 3 | Open emitter | verified |
| Burris FastFire 4 | Open emitter | verified |
| Vortex Venom | Open emitter | verified |
| Vortex Viper | Open emitter | verified |
| Noblex (Docter) Sight 2 Plus | Open emitter | verified |
| Leica Tempus / Tempus 2 | Open emitter | verified |
| Meopta MeoSight IV | Open emitter | verified |
| Athlon Midas TSR1 | Open emitter | verified |
| Sightmark Mini Shot M-Spec | Open emitter | verified |
| Delta Optical MiniDot 3 | Open emitter | verified |
| UTG OP3 Micro | Open emitter | verified |
| US Optics DRS 2.0 | Open emitter | verified |
Verified ways to mount this footprint: Glock MOS (any MOS model) · 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 (check cut generation!) · 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)
Shield RMSc
The slimline standard used by micro-compact optic-ready pistols. Footprint reference
| Optic on this footprint | Type | Source |
|---|---|---|
| Steiner MPS-C | Enclosed emitter | verified |
| Shield RMSc | Open emitter | verified |
| Shield RMS2 | Open emitter | verified |
| SIG RomeoZero / RomeoZero Elite | Open emitter | verified |
| Vortex Defender-CCW | Open emitter | verified |
| Swampfox Sentinel | Open emitter | verified |
Verified ways to mount this footprint: 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 (check cut generation!) · 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 · Ruger RXM (multi-footprint pin cut) · Taurus GX4 T.O.R.O. · SIG P365 family (X / XL / XMACRO optic-ready) · CZ P-10 series OR (C/F/S)
Trijicon RMR
The most common US slide cut. Not directly compatible with ACRO or Docter optics — adapters exist. Footprint reference
| Optic on this footprint | Type | Source |
|---|---|---|
| Trijicon RMR (Type 2) | Open emitter | verified |
| Trijicon RMR HD | Open emitter | verified |
| Trijicon SRO | Open emitter | verified |
| Holosun 507C (X2) | Open emitter | verified |
| Holosun 407C (X2) | Open emitter | verified |
| Holosun 508T (X2) | Open emitter | verified |
Verified ways to mount this footprint: 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 (check cut generation!) · 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 509 / 510 / 545 MRD (Low-Profile Optics Mounting System) · CZ P-10 series OR (C/F/S)
Leupold DeltaPoint Pro
Its own standard. Physically sits on Shield mounts but does NOT lock securely (4.2mm vs 3.8mm sockets) — never mix them. Footprint reference
| Optic on this footprint | Type | Source |
|---|---|---|
| Leupold DeltaPoint Pro | Open emitter | verified |
| Vortex Defender-ST | Open emitter | verified |
Verified ways to mount this footprint: 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 (check cut generation!) · 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 509 / 510 / 545 MRD (Low-Profile Optics Mounting System) · CZ P-10 series OR (C/F/S)
Holosun K
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. Footprint reference
| Optic on this footprint | Type | Source |
|---|---|---|
| Holosun 407K (X2) | Open emitter | verified |
| Holosun 507K (X2) | Open emitter | verified |
| Holosun EPS Carry | Enclosed emitter | verified |
| Holosun EPS (full size) | Enclosed emitter | verified |
Verified ways to mount this footprint: Glock Slimline MOS-K (G43X/G48 MOSK) · Springfield XD-M / XD-M Elite OSP · 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 · Taurus GX4 T.O.R.O.
C-More STS/RTS
Competition-optic standard (C-More STS2/RTS2; several makers group Vortex Razor and SIG Romeo3 here). Footprint reference
Verified ways to mount this footprint: 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)
SIG Sauer PRO
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. Footprint reference
| Optic on this footprint | Type | Source |
|---|---|---|
| SIG Romeo1 Pro | Open emitter | verified |
| SIG Romeo2 | Open emitter | verified |
Verified ways to mount this footprint: SIG P320 Pro-Cut slide
SIG-LOC Compact
SIG's newer Leverage Optimized Connection mount; SIG-LOC slides remain backward-compatible with Shield RMSc optics. Footprint reference
Verified ways to mount this footprint: SIG P365 family (X / XL / XMACRO optic-ready)
Aimpoint COA / A-CUT
Proprietary plate-free interface co-developed by Aimpoint and Glock; only the Aimpoint COA fits it. Footprint reference
| Optic on this footprint | Type | Source |
|---|---|---|
| Aimpoint COA | Enclosed emitter | verified |
Verified ways to mount this footprint: Glock Aimpoint A-CUT (COA models)
Holosun 509T
The enclosed 509T's own pattern — excluded even from Glock's Holosun plate groups; hosts need a dedicated 509T plate. Footprint reference
Verified ways to mount this footprint: Walther PDP (check cut generation!)
How We Verify
A pairing enters this database only when the plate, adapter, or direct fit is confirmed by manufacturer documentation — Aimpoint's published plate line, Steiner's official compatibility list, Burris's mounting guides, or the measured footprint database at Optics Trade. Body-clearance exceptions (same footprint, different housing size) are flagged where we've verified them. Spot an error or a missing combination? Tell us — corrections get priority. For the deeper background, see our Docter/FastFireand ACRO/MPS footprint guides.
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 (Glock MOS, M&P CORE, and similar) list which footprints each numbered plate supports, and direct-milled slides name their cut (RMR, RMSc, ACRO). When in doubt, the plate or cut name is in your owner's manual. Never guess from photos: several footprints look alike but differ in screw spacing and recoil-boss geometry.
Can I put an ACRO-footprint optic on an RMR-cut slide?
Yes, with an RMR-to-ACRO adapter — Primary Machine and Strike Industries both make one, and both appear on Steiner's official MPS compatibility list. The caveat with every adapter: added height, which can lift the optic above your iron sights. Direct plates are always the cleaner path when they exist.
Why does this tool say "not yet verified" for some combinations?
Because we only publish pairings we have confirmed against manufacturer documentation — the same standard as everything else on this site. Combinations we haven't verified yet get flagged honestly instead of guessed. The database grows in verified batches; if your combination is missing, the footprint tables below still tell you what standard each side uses.
Do same-footprint optics always interchange?
On flat plates, yes. In form-fitted housings, not necessarily — the classic trap is the Burris AR-F3 mount, shaped around the FastFire body, which a same-footprint Vortex Venom physically won't fit inside. Body dimensions matter beyond the screw pattern; the tool flags the known cases.