Red Dot Footprint Chart: Which Optic Fits Which Cut
This red dot footprint chart matches optics to slide cuts. A red dot footprint is the bolt pattern and recoil-lug shape on the base of the optic, so you match pattern to slide cut, never to a brand name.
A red dot footprint is the bolt pattern and recoil-lug shape on the base of the optic. Match the optic pattern to the pattern your slide is cut for, not to a brand name.
This chart is a lookup, not an explainer. It holds 8 mounting patterns and 19 optics, and every compatibility line on it was taken from the maker’s own product page and matched word for word against the bytes that page returned on 2026-08-25. Where a maker publishes nothing, the row says so. For the background — what a footprint is, adapter plates against direct milling, the mistakes people make — read the red dot footprint guide.
Read this before you read the chart. When a mount maker says a part fits the RMR footprint, that is a statement about the part it is selling. It is not a statement about the cut in your slide. Three different questions get answered with the same sentence and they are not the same question:
- What pattern is my slide cut for? That is the pistol maker’s fact, and almost no optic maker states it. Check the pistol.
- What pattern is the optic? That is on the chart below, from the optic maker’s own page.
- Is there a plate between them? A plate changes the pattern and it changes the height. It is a third part with its own part number.
An optic and a slide that both answer to the words RMR footprint can still need a plate, and a plate that fits your slide can still be the wrong plate for your optic.
Red dot footprint chart: look up a mounting pattern
Trijicon RMR
Also sold as: RMR, RMR Type 2, RMR footprint, RMR cut, Trijicon RMR pattern
The pattern most optics-ready full-size slides are cut for, and the one most often named by mount makers. Trijicon’s own page confirms Type 1 and Type 2 share it.
Mounting screw thread: #6-32 (imperial) source
Screw spacing: Trijicon does not publish a screw-spacing dimension on the pages retrieved.
| Optic | Maker | How it mounts | What the maker says |
|---|---|---|---|
| Trijicon RMR Type 2 | Trijicon | Direct | The RMR® Type 2 has identical physical dimensions and mounting footprint to that of the original RMR Type 1 source |
| Trijicon RMR HD | Trijicon | Direct | Mounts easily on popular red-dot-ready pistols using the same base as Trijicon RMR source |
| Trijicon SRO | Trijicon | Direct | Mounts easily using the same base as the Trijicon RMR source |
| Trijicon RCR | Trijicon | Direct | works with the current RMR bolt pattern and direct mounts without the use of a dovetail source |
| Holosun HE507C-X2 | Holosun | Direct | Fitment Direct Mount RMR Footprint source |
| Holosun HE508T-X2 | Holosun | Direct | Fitment Direct Mount RMR Footprint source |
Shield RMSc
Also sold as: RMSc, RMSc footprint, RMSc cut, Shield RMSc, Shield compact pattern
The slimline standard. NOT the same pattern as Shield’s full-size RMS, even though Shield’s own product pages call both ‘the SHIELD footprint’.
Mounting screw thread: Not published by Shield on the pages retrieved.
Screw spacing: Swampfox, which builds to the pattern, describes it as two screw holes with four corner sockets for recoil lugs or pins.
| Optic | Maker | How it mounts | What the maker says |
|---|---|---|---|
| Steiner MPS-C | Steiner | Direct | the MPS-C features an RMSc footprint and an exceptionally low profile source |
| Shield RMSc | Shield Sights | Direct | Mount: The SHIELD footprint source |
| Swampfox Sentinel II | Swampfox | Direct | this micro pistol dot sight maintains the standardized RMSc footprint source |
Shield RMS / SMS
Also sold as: RMS, SMS, RMS2, SMS2, Shield RMS, JPoint pattern
Shield’s full-size pattern. Shield’s own catalog lists RMS/SMS mounts and RMSc mounts as different products, which is the clearest evidence on Shield’s own site that the two cuts are not interchangeable.
Mounting screw thread: Not published by Shield on the pages retrieved.
Screw spacing: Shield does not publish a screw-spacing dimension on the pages retrieved.
| Optic | Maker | How it mounts | What the maker says |
|---|---|---|---|
| Shield RMS2 | Shield Sights | Direct | Mount: The SHIELD footprint source |
Holosun K
Also sold as: K footprint, Holosun K, K-pattern, 407K, 507K, EPS Carry
Holosun’s own micro pattern. It is NOT the RMSc pattern: Holosun ships an ‘RMSc to K’ adapter plate with the EPS Carry, which only makes sense if the two cuts differ.
Mounting screw thread: M3 and M4 (metric) shipped with the optic source
Screw spacing: Holosun does not publish a screw-spacing dimension on the pages retrieved.
| Optic | Maker | How it mounts | What the maker says |
|---|---|---|---|
| Holosun HE407K-X2 | Holosun | Direct | Fitment Direct Mount K Footprint source |
| Holosun HE507K-X2 | Holosun | Direct | Fitment Direct Mount K Footprint source |
| Holosun EPS Carry | Holosun | Direct or plate | Fitment Direct Mount K Footprint Included Adapter Plate RMSc to K Footprint source |
| Holosun EPS | Holosun | Direct or plate | Fitment Direct Mount K Footprint Included Adapter Plate RMR to K Plate source |
Aimpoint Acro
Also sold as: ACRO, Acro footprint, Acro P-1, Acro P-2, Steiner MPS pattern
Everyone else calls it ‘the Acro footprint’. Aimpoint does not: its own product page sells a named adapter plate per pistol instead. That gap is the single best illustration of the trap on this page.
Mounting screw thread: Not published by Aimpoint on the pages retrieved.
Screw spacing: Aimpoint does not publish a screw-spacing dimension on the pages retrieved.
| Optic | Maker | How it mounts | What the maker says |
|---|---|---|---|
| Steiner MPS | Steiner | Plate needed | The Micro Pistol Sight is designed to fit an ACRO footprint and is compatible with most optic-ready pistols using ACRO baseplate adapters source |
| Steiner MPS 2.0 | Steiner | Direct | Compatible with the widely adopted Aimpoint® ACRO mounting footprint source |
| Aimpoint Acro P-2 | Aimpoint | Plate needed | The sight can be mounted on a wide range of optics-ready handguns using adapter plates source |
Holosun 509T
Also sold as: 509T, 509T footprint
A footprint of its own, which Holosun names as such. It reaches RMR-cut slides only through the adapter plate in the box.
Mounting screw thread: #6-32 (imperial), supplied for the RMR adapter plate source
Screw spacing: Holosun does not publish a screw-spacing dimension on the pages retrieved.
| Optic | Maker | How it mounts | What the maker says |
|---|---|---|---|
| Holosun HE509T-X2 | Holosun | Plate needed | Fitment Direct Mount 509T Footprint Included Adapter Plate RMR to 509T Adapter Plate source |
Docter / Noblex
Also sold as: Docter, Doctor footprint, Noblex, DOCTER sight pattern, Burris FastFire pattern, Vortex Venom pattern, Meopta MeoSight pattern
The most-aliased pattern on this page and the least documented. It carries at least six brand words in ordinary use, and not one of the companies whose name is attached to it uses the word footprint about it on the product pages this build retrieved. Everything you read about it traces to retailers and forums, not to a maker.
Mounting screw thread: Not published by any maker on the pages retrieved.
Screw spacing: No maker retrieved for this build names this pattern on its own product page. The only maker reference to it we could verify is Swampfox’s, comparing the RMSc standard against Noblex optics.
C-More RTS2 / STS2
Also sold as: RTS2, STS2, C-More RTS, C-More STS
A competition pattern with its own screw thread. The thread alone rules out a swap with an RMR-cut slide.
Mounting screw thread: 8-32 (imperial) source
Screw spacing: C-More does not publish a screw-spacing dimension on the pages retrieved.
| Optic | Maker | How it mounts | What the maker says |
|---|---|---|---|
| C-More RTS2 | C-More | Direct | RTS2B model includes direct mounting screws (8-32×1/2) but does not include a mount source |
Start with your pistol
Almost nobody arrives here asking about a pattern. They arrive asking what fits the gun they already own. So we went to the pistol makers and asked their own pages the same way we asked the optic makers, for the 16 pistols people search for most.
The pistol makers are worse than the optic makers. Of the pistols below we could get a straight answer from the manufacturer for 6. Glock, whose G43X MOS is the best-known optics-ready slimline in the country, says only that the slide is cut for “specific micro-optics” and names no pattern at all. Several makers would not serve us product information. For the single most common question in this whole subject, the company that made your gun mostly will not answer it.
Canik METE SFT
Maker states it Two different footprints depending on serial number.
The single most useful row on this page. Canik changed the optic cut mid-production and publishes the exact serial number where it changes. Buy the wrong optic for your serial and it does not fit.
Serial numbers after 25CC08376 feature an RMR® and RMS/ RMSc ® optics footprint source
Serial numbers prior to 25CC08376 feature an RMRcc ® and RMS/ RMSc ® compatible optics footprint source
Canik TTI Combat
Maker states it Shield RMSc and Trijicon RMR, plus four Canik-branded options.
Canik names both an industry pattern and its own brand words in one list.
Compatible with Shield RMSc, Trijicon RMR, CANiK ONYXc, CANiK PHANTOMc, CANiK ONYX XL, and CANiK PHANTOM source
Canik METE MC9 Prime
Maker states it Shield RMSc, plus two Canik-branded options.
No RMR here, unlike the TTI Combat.
compatibility with Shield RMSc, CANiK ONYXc, and CANiK PHANTOMc source
Springfield Hellcat Pro
Maker states it Springfield calls it the Springfield Micro footprint.
A pattern named after the pistol maker rather than the optic maker. Springfield does not say on this page which optic-maker pattern it corresponds to.
The slide is milled with the Springfield Micro™ footprint, designed to accept the smallest, most popular micro red dots on the market source
Springfield Echelon
Maker states it No single footprint. The slide takes configurable pins.
The Echelon is the exception that breaks the question. Springfield mills a pin field and you configure the pins to the optic, so asking what footprint it is has no single answer.
Simply configure the self-locking pins for the footprint of your desired optic to achieve a low, direct mount source
Echelon™ Variable Interface System Plate for ACRO and DOCTER Footprint source
Smith and Wesson Shield X
Maker states it A flat-plane RMSc / K optic cut.
One of the very few pistol pages in this set that names two industry patterns at once.
A flat-plane RMSc/K optic cut and front rail allow you to customize to your needs source (this sentence is in the maker’s page data rather than its visible prose, so a crawler reading the page as text will not see it)
Glock 43X MOS
Maker does not name a pattern Glock names no pattern at all.
The best-known optics-ready slimline in the country, and the maker’s own page says only that the slide is cut for specific micro-optics. It also states that no adapter plates are included.
the G43X MOS features slide cuts designed for specific micro-optics source
The G43X with the Modular Optic System (MOS) does not come with adapter plates source
The pistols we could not answer, and exactly why
Every line below is a fact about what a fetch returned on 2026-08-25. None of it is a claim about the product, and none of it means the pistol will not take an optic. It means the maker did not tell us, or would not serve us the page.
| Pistol | Maker | What happened |
|---|---|---|
| SIG P365 / P320 / P322 | SIG Sauer | sigsauer.com returned HTTP 403 to this build |
| HK CC9 | HK | hk-usa.com returned HTTP 403 to this build |
| Taurus TX22 | Taurus | taurususa.com returned HTTP 202 with a 169-byte challenge body |
| PSA Dagger | Palmetto State Armory | palmettostatearmory.com returned HTTP 403 |
| Ruger RXM, Ruger Max-9 | Ruger | ruger.com served BYTE-IDENTICAL content for two different product URLs, so what came back was an application shell and not product information |
| CZ Shadow 2 Carry, CZ P-10 C | CZ | cz-usa.com served byte-identical content for a product URL and a category URL, so what came back was an application shell and not product information |
| Walther PDP | Walther | every product path tried returned HTTP 404 |
| FN 502, FN Reflex | FN America | the product pages were retrieved in full and never use the word footprint |
| Smith and Wesson Shield Plus | Smith and Wesson | the product page was retrieved in full and names no optic pattern |
One of those rows is a trap worth naming. Two makers returned byte-identical content for two different product URLs. A page that loads is not a page that answered: if the same bytes come back for a Ruger RXM and a Ruger Max-9, what arrived was an application shell, and treating it as product information would have produced a confident claim built on nothing.
What people are actually looking up
We build from demand, not from guesswork, so here is the demand. These are the monthly US search volumes for the question “what optic fits this pistol”, measured in Ahrefs on 2026-08-25. This is search demand, not this page’s own traffic — once the page has been live long enough to have any, we will publish what readers here actually look up alongside it.
| Pistol | US searches per month | Does the maker answer it? |
|---|---|---|
| Ruger RXM | 600 | Could not be established |
| Springfield Hellcat Pro | 350 | Yes |
| Canik TTI Combat | 300 | Yes |
| Glock 43X | 250 | Maker names no pattern |
| SIG P320 | 250 | Could not be established |
| SIG P365 | 250 | Could not be established |
| Walther PDP | 250 | Could not be established |
| Springfield Echelon | 250 | Yes |
| Canik METE MC9 Prime | 250 | Yes |
| SIG P322 | 200 | Could not be established |
| Smith and Wesson Shield X | 200 | Yes |
| Taurus TX22 | 200 | Could not be established |
| Smith and Wesson Shield Plus | 200 | Could not be established |
| CZ Shadow 2 Carry | 200 | Could not be established |
| Canik METE SFT | 150 | Yes |
| Ruger Max-9 | 150 | Could not be established |
| FN 502 | 150 | Could not be established |
| Smith and Wesson M and P 2.0 | 150 | Could not be established |
| Springfield Prodigy | 150 | Could not be established |
| PSA Dagger | 150 | Could not be established |
| HK CC9 | 150 | Could not be established |
| CZ P-10 C Ported | 150 | Could not be established |
| Glock Gen 6 | 150 | Could not be established |
| FN Reflex | 100 | Could not be established |
That is 5,200 searches a month across 24 pistols, and the manufacturer answers 1,500 of them. The gap is the reason this page exists.
Tell us what is missing. If your pistol is not on this page, it is because the maker does not publish the answer or would not serve us the page. Those are the ones we chase next, and reader requests decide the order.
Why the same pattern has several names
The pattern is the thing. The brand word is not. A reader who arrives asking whether a Holosun fits a Shield cut is asking about two patterns that happen to be named after two companies, and the answer changes with the pattern, not the badge. These are the names in circulation for each pattern on this page.
| Pattern | Names in circulation | Screw thread the maker publishes |
|---|---|---|
| Trijicon RMR | RMR, RMR Type 2, RMR footprint, RMR cut, Trijicon RMR pattern | #6-32 (imperial) |
| Shield RMSc | RMSc, RMSc footprint, RMSc cut, Shield RMSc, Shield compact pattern | Not published by Shield on the pages retrieved. |
| Shield RMS / SMS | RMS, SMS, RMS2, SMS2, Shield RMS, JPoint pattern | Not published by Shield on the pages retrieved. |
| Holosun K | K footprint, Holosun K, K-pattern, 407K, 507K, EPS Carry | M3 and M4 (metric) shipped with the optic |
| Aimpoint Acro | ACRO, Acro footprint, Acro P-1, Acro P-2, Steiner MPS pattern | Not published by Aimpoint on the pages retrieved. |
| Holosun 509T | 509T, 509T footprint | #6-32 (imperial), supplied for the RMR adapter plate |
| Docter / Noblex | Docter, Doctor footprint, Noblex, DOCTER sight pattern, Burris FastFire pattern, Vortex Venom pattern, Meopta MeoSight pattern | Not published by any maker on the pages retrieved. |
| C-More RTS2 / STS2 | RTS2, STS2, C-More RTS, C-More STS | 8-32 (imperial) |
Three pairs that are not the same pattern
Shield RMS is not Shield RMSc. Shield’s own product pages describe both as mounting to “the SHIELD footprint”, which is the least helpful sentence on this page. Shield’s own catalog settles it: it lists RMS and SMS mounts as one product family and RMSc mounts as another, item by item.
Holosun K is not Shield RMSc. Holosun ships the EPS Carry with an RMSc-to-K adapter plate. A plate between two patterns is the clearest evidence there can be that they are two patterns. Holosun’s own fitment line reads: “Fitment Direct Mount K Footprint Included Adapter Plate RMSc to K Footprint”.
Holosun 509T is not the RMR. Holosun names 509T as a footprint of its own and puts an RMR-to-509T plate in the box.
What the makers actually publish
Every other footprint chart prints screw spacings. We could not verify one. Of the 8 patterns here, 4 have a mounting screw thread published by a maker on its own page, and zero have a published screw-spacing dimension anywhere in the 39 pages this build retrieved. That is the honest state of the record, and it is why a compatibility claim can only ever be traced to a sentence, never checked against a measurement.
| Pattern | Screw thread published | Screw spacing published | Lug or pin arrangement described |
|---|---|---|---|
| Trijicon RMR | Yes — #6-32 (imperial) | No | Trijicon does not publish a screw-spacing dimension on the pages retrieved. |
| Shield RMSc | No | No | Swampfox, which builds to the pattern, describes it as two screw holes with four corner sockets for recoil lugs or pins. |
| Shield RMS / SMS | No | No | Shield does not publish a screw-spacing dimension on the pages retrieved. |
| Holosun K | Yes — M3 and M4 (metric) shipped with the optic | No | Holosun does not publish a screw-spacing dimension on the pages retrieved. |
| Aimpoint Acro | No | No | Aimpoint does not publish a screw-spacing dimension on the pages retrieved. |
| Holosun 509T | Yes — #6-32 (imperial), supplied for the RMR adapter plate | No | Holosun does not publish a screw-spacing dimension on the pages retrieved. |
| Docter / Noblex | No | No | No maker retrieved for this build names this pattern on its own product page. The only maker reference to it we could verify is Swampfox’s, comparing the RMSc standard against Noblex optics. |
| C-More RTS2 / STS2 | Yes — 8-32 (imperial) | No | C-More does not publish a screw-spacing dimension on the pages retrieved. |
The one description of a lug and pin arrangement we could verify comes from Swampfox, which builds to the pattern rather than owning it: “the RMSc Mounting Standard features two screw holes and four sockets in each corner to accept recoil lugs/pins, though wider and closer together than Noblex optics”. We record it as Swampfox’s account of the standard, not as Shield’s.
The only mounting geometry anyone publishes
Here is the sentence that surprised us most while building this page. Every maker that names a footprint publishes no geometry, and the one maker that publishes geometry names no footprint. Vortex puts a dimensioned drawing on its own product pages for 7 optics and never once uses a pattern name in the product copy. Trijicon, Holosun, Shield, Steiner, Aimpoint, Swampfox and C-More all name patterns freely and publish no drawing at all.
| Drawing | Machine-readable? | File |
|---|---|---|
| Vortex Venom red dot (VMD-3103) | No — a single flat image, no extractable text | drawing (PDF) |
| Vortex Venom red dot (VMD-3106) | No — a single flat image, no extractable text | drawing (PDF) |
| Vortex Viper red dot (VRD-6) | No — a single flat image, no extractable text | drawing (PDF) |
| Vortex Razor red dot (RZR-2001) | No — a single flat image, no extractable text | drawing (PDF) |
| Vortex Razor red dot (RZR-2003) | No — a single flat image, no extractable text | drawing (PDF) |
| Vortex Defender-CCW micro red dot | Yes — 180 characters of dimension text | drawing (PDF) |
| Vortex Defender-ST micro red dot | Yes — 141 characters of dimension text | drawing (PDF) |
Why we have not put those numbers in the chart. 2 of the 7 files carry extractable dimension text, and the text gives the numbers without saying which hole each one belongs to. Reading a callout onto a feature by eye and printing the result as a manufacturer’s published spacing is how a compatibility chart becomes confidently wrong about a named company. So the callouts are reproduced below exactly as they come out of the file, as callouts, and the drawings are linked so you can look at them yourself. The five image-only files are not transcribed at all: this build does not run text recognition over a drawing and then present the output as something the maker published.
| Drawing | Dimension callouts, verbatim from the file |
|---|---|
| Vortex Defender-CCW micro red dot | 40.30 source |
| Vortex Defender-ST micro red dot | 25.40 17.00 14.00 17.00 29.7 source |
Vortex also states, on the Defender-ST drawing and in its own extractable text, “4X 4.20”. It is a hole count and a diameter, and it is more mounting geometry than the rest of the industry publishes put together.
The plate is a third part
Two makers on this page state the plate requirement in their own words, and they point in opposite directions, which is the point.
Trijicon names the pistols that need a kit: “If selecting an RMR for mounting on the Glock® MOS, Springfield® OSP, Walther® PDP, or H and K® VP9 Optics Ready, a Trijicon RMR® mounting kit (AC32064) is required”.
Aimpoint never uses the phrase “Acro footprint” on its own Acro P-2 page at all. It says “The sight can be mounted on a wide range of optics-ready handguns using adapter plates” and sells a separately numbered plate for each pistol. Everyone else calls it the Acro footprint; the company that owns it does not.
And the sentence that should worry you. Burris writes of the FastFire 3: “The FastFire 3 will work with virtually every “optics ready” handgun”. Read literally that is a claim about every optics-ready handgun ever made. It is the shape of sentence this whole page exists to slow you down on.
What is not on this red dot footprint chart, and why
These makers are absent because their sites refused retrieval to this build on 2026-08-25, or published nothing to quote. An absence here is a fact about the fetch and not a claim about the product. Nothing below should be read as a claim that these companies publish nothing or that their optics do not fit anything.
| Maker | What the fetch returned |
|---|---|
| SIG Sauer | HTTP 403 |
| Vortex Optics | HTTP 406 on every product page tried |
| Noblex | retrieved, but the product page never uses the word footprint, so there is nothing to quote |
Questions this red dot footprint chart answers
- Is the Holosun 507C the same footprint as the RMR?
- Holosun states it is. Its own fitment line for the HE507C-X2 reads “Fitment Direct Mount RMR Footprint”. That is Holosun’s claim about Holosun’s optic, which is the strongest kind of evidence available here.
- Are the RMR and RMSc footprints the same?
- No. They are different patterns for different slide sizes, and no maker on this page describes an optic as fitting both without a plate.
- Is the Holosun K footprint the same as RMSc?
- No. Holosun includes an RMSc-to-K adapter plate with the EPS Carry, which only makes sense if the two cuts differ.
- Does my pistol have an RMR cut?
- No optic maker can tell you that. It is a fact about your slide, published by the company that made the pistol. Every claim on this chart is about an optic.
- What screw thread does the RMR footprint use?
- Trijicon ships the RMR with #6-32 screws: “2ea #6-32 x1/2” Torx Head Screw”. C-More’s RTS2 uses 8-32 and Holosun’s K optics ship metric M3 and M4. The thread alone rules out several swaps people attempt.
- How high does the optic sit, and does that change my zero?
- It does, and by a knowable amount. Mounting height is the input a ballistic solution takes as sight height over bore, and it is worked out on the scope ring height and sight height calculator.
How to read a “does not publish” row
Where this chart says a maker does not publish a dimension, that is a statement about their published documentation on 25 August 2026, and nothing more. It is not a claim that the dimension does not exist, that the product is deficient, or that anyone did anything wrong — plenty of sound engineering never reaches a public spec sheet. If a maker publishes the figure somewhere we did not reach, we would rather be told than be right: the row will be updated and dated.
Every source, and the words we took from it
Each row was fetched from the maker on 2026-08-25, stored, and the quote matched against the bytes that came back. A row is on this page because that match succeeded.
| Claim | Quote matched against the returned bytes | Source | Retrieved |
|---|---|---|---|
| aimpoint acro axis22 | For mounting ACRO sights on Weaver or Picatinny rail at 22 mm optic axis | www.aimpoint.us | 2026-08-25 |
| aimpoint acro p2 | The sight can be mounted on a wide range of optics-ready handguns using adapter plates | www.aimpoint.us | 2026-08-25 |
| burris ff3 universal | The FastFire 3 will work with virtually every “optics ready” handgun | www.burrisoptics.com | 2026-08-25 |
| burris height to center | Ring Height Height to Center | www.burrisoptics.com | 2026-08-25 |
| canik mc9 | compatibility with Shield RMSc, CANiK ONYXc, and CANiK PHANTOMc | www.canikusa.com | 2026-08-25 |
| canik sft | Serial numbers after 25CC08376 feature an RMR® and RMS/ RMSc ® optics footprint | www.canikusa.com | 2026-08-25 |
| canik sft prior | Serial numbers prior to 25CC08376 feature an RMRcc ® and RMS/ RMSc ® compatible optics footprint | www.canikusa.com | 2026-08-25 |
| canik tti | Compatible with Shield RMSc, Trijicon RMR, CANiK ONYXc, CANiK PHANTOMc, CANiK ONYX XL, and CANiK PHANTOM | www.canikusa.com | 2026-08-25 |
| cmore rts2 | RTS2B model includes direct mounting screws (8-32×1/2) but does not include a mount | cmore.com | 2026-08-25 |
| cmore rts2 screws | direct mounting screws (8-32×1/2) | cmore.com | 2026-08-25 |
| drawing ccw | 40.30 | vortexoptics.widen.net | 2026-08-25 |
| drawing st | 25.40 17.00 14.00 17.00 29.7 | vortexoptics.widen.net | 2026-08-25 |
| drawing st holes | 4X 4.20 | vortexoptics.widen.net | 2026-08-25 |
| egw basis | we measure from the highest point on the Picatinny or Weaver rail to the dead center of where the scope will sit | egwguns.com | 2026-08-25 |
| egw numbers | 1-Inch Keystone Rings .850” Low .990” Medium 1.275” High | egwguns.com | 2026-08-25 |
| egw split | A “Low” from one company might be a “Medium” from another | egwguns.com | 2026-08-25 |
| glock 43x mos | the G43X MOS features slide cuts designed for specific micro-optics | us.glock.com | 2026-08-25 |
| glock 43x no plates | The G43X with the Modular Optic System (MOS) does not come with adapter plates | us.glock.com | 2026-08-25 |
| holosun 407k | Fitment Direct Mount K Footprint | www.holosun.com | 2026-08-25 |
| holosun 507c | Fitment Direct Mount RMR Footprint | www.holosun.com | 2026-08-25 |
| holosun 507k | Fitment Direct Mount K Footprint | www.holosun.com | 2026-08-25 |
| holosun 507k screws | Screws Included – 2x M4x12mm 2x M3x12mm | www.holosun.com | 2026-08-25 |
| holosun 508t | Fitment Direct Mount RMR Footprint | www.holosun.com | 2026-08-25 |
| holosun 509t | Fitment Direct Mount 509T Footprint Included Adapter Plate RMR to 509T Adapter Plate | www.holosun.com | 2026-08-25 |
| holosun 509t screws | RMR to 509T Adapter Plate | www.holosun.com | 2026-08-25 |
| holosun eps | Fitment Direct Mount K Footprint Included Adapter Plate RMR to K Plate | www.holosun.com | 2026-08-25 |
| holosun epscarry | Fitment Direct Mount K Footprint Included Adapter Plate RMSc to K Footprint | www.holosun.com | 2026-08-25 |
| leupold categories | Ring Height Style Super Low 1 Low 18 Medium 50 High 49 Super High 10 | www.leupold.com | 2026-08-25 |
| leupold chart | FIT RING HEIGHT TO OBJECTIVE DIAMETER | www.leupold.com | 2026-08-25 |
| scalarworks basis | Optic center height over rail | scalarworks.com | 2026-08-25 |
| seekins numbers | 30mm — 0.82” Low | seekinsprecision.com | 2026-08-25 |
| shield rms2 | Mount: The SHIELD footprint | www.shieldsights.com | 2026-08-25 |
| shield rmsc | Mount: The SHIELD footprint | www.shieldsights.com | 2026-08-25 |
| springfield echelon | Simply configure the self-locking pins for the footprint of your desired optic to achieve a low, direct mount | www.springfield-armory.com | 2026-08-25 |
| springfield echelon vis | Echelon™ Variable Interface System Plate for ACRO and DOCTER Footprint | www.springfield-armory.com | 2026-08-25 |
| springfield hellcat pro | The slide is milled with the Springfield Micro™ footprint, designed to accept the smallest, most popular micro red dots on the market | www.springfield-armory.com | 2026-08-25 |
| steiner mps | The Micro Pistol Sight is designed to fit an ACRO footprint and is compatible with most optic-ready pistols using ACRO baseplate adapters | www.steiner-optics.com | 2026-08-25 |
| steiner mps2 | Compatible with the widely adopted Aimpoint® ACRO mounting footprint | www.steiner-optics.com | 2026-08-25 |
| steiner mpsc | the MPS-C features an RMSc footprint and an exceptionally low profile | www.steiner-optics.com | 2026-08-25 |
| sw shield x | A flat-plane RMSc/K optic cut and front rail allow you to customize to your needs | www.smith-wesson.com | 2026-08-25 |
| swampfox rmsc lugs | the RMSc Mounting Standard features two screw holes and four sockets in each corner to accept recoil lugs/pins, though wider and closer together than Noblex optics | www.swampfoxoptics.com | 2026-08-25 |
| swampfox sentinel2 | this micro pistol dot sight maintains the standardized RMSc footprint | www.swampfoxoptics.com | 2026-08-25 |
| trijicon rcr | works with the current RMR bolt pattern and direct mounts without the use of a dovetail | www.trijicon.com | 2026-08-25 |
| trijicon rmr plate | If selecting an RMR for mounting on the Glock® MOS, Springfield® OSP, Walther® PDP, or H and K® VP9 Optics Ready, a Trijicon RMR® mounting kit (AC32064) is required | www.trijicon.com | 2026-08-25 |
| trijicon rmr screws | 2ea #6-32 x1/2” Torx Head Screw | www.trijicon.com | 2026-08-25 |
| trijicon rmr t2 | The RMR® Type 2 has identical physical dimensions and mounting footprint to that of the original RMR Type 1 | www.trijicon.com | 2026-08-25 |
| trijicon rmrhd | Mounts easily on popular red-dot-ready pistols using the same base as Trijicon RMR | www.trijicon.com | 2026-08-25 |
| trijicon sro | Mounts easily using the same base as the Trijicon RMR | www.trijicon.com | 2026-08-25 |
| vortex defender ccw drawing link | Footprint (PDF) | vortexoptics.com | 2026-08-25 |
| vortex venom drawing link | Footprint (PDF) | vortexoptics.com | 2026-08-25 |
| warne formula | Or minus Tr minus Bh = Mrh | warnescopemounts.com | 2026-08-25 |
| warne low | our low rings measure between .250 and .275 depending on which style | warnescopemounts.com | 2026-08-25 |
| warne terms | Or = Objective Radius Tr = Tube Radius Bh = Base or rail height measured at the front of the receiver Mrh = Minimum ring height | warnescopemounts.com | 2026-08-25 |
Where to go next
Data updated September 2026.
- Red dot footprints explained — what a footprint is and how to identify yours.
- Scope ring height and sight height calculator — the height half of the same problem.
- How to zero a pistol red dot — once it is mounted.
- Firearm glossary — footprint, deck height, co-witness and the rest.
How this page is maintained. Reviewed annually, and whenever a maker introduces a pattern or renames one. Last verified against every source listed above on 2026-08-25. If a maker’s page changes and a quote here no longer appears in it, the row comes off this page rather than being quietly reworded.