Red Dot Footprint Guide: RMR vs RMSc vs Holosun K — Which Optic Fits Your Slide
TakTactical Buyer's Guide · OPTICS
Red Dot Footprint Guide: RMR vs RMSc vs Holosun K
The #1 reason pistol optics get returned: the footprint doesn't match the slide cut. Here's how to get it right the first time.
What Is a Footprint?
The footprint is the bolt pattern and recoil-lug layout machined into the bottom of the optic. Your slide (or adapter plate) must carry the SAME pattern. There are three dominant standards in pistol optics — and they are NOT interchangeable without a plate.
| Footprint | Size class | Popular optics using it | Typical host |
|---|---|---|---|
| Trijicon RMR | Full size | RMR, RMR HD, Holosun 507C/508T, Meprolight MPO-F | Glock 17/19 MOS, P320, duty pistols, AR/AK mounts |
| Shield RMSc | Micro/compact | Shield RMSc, Holosun 507K/407K, Meprolight MPO-S/DS, SIG RomeoZero | Glock 43X/48 MOS, P365, Hellcat, slim carry guns |
| DeltaPoint Pro | Full size | Leupold DPP, Holosun EPS (via plate) | M&P CORE, some factory cuts |
In-Stock Optics by Footprint
RMR Footprint (full size)
- Trijicon RMR Type 2 — 3.25 MOA — $542.63. The standard everything else is measured against.
- Meprolight MPO PRO-F — 3/33 MOA circle-dot, RMR footprint — $399.99. Israeli-built enclosed emitter at a serious price advantage. Standard MPO-DF 3.5 MOA just $189.99.
RMSc Footprint (micro — carry guns)
- Meprolight MPO PRO-S — 3/33 MOA, RMSc footprint — $319.99. Enclosed micro dot for Glock 43X/48 MOS and P365 optic-ready slides.
- Meprolight MPO-DS 3.5 MOA RMSc — $199.99. Open-emitter budget pick for slim slides.
Adapter Plates & Mounts — the fix when footprints don't match
- C&H Precision plate — Glock 43X/48 MOS to Holosun EPS — $51.99. Lets the enclosed EPS ride on the slim MOS cut.
- Kimber 1911 RMR mounting plate — $91.30.
- Reptilia ROF-45 30mm RMR offset mount — $107.96 — puts an RMR at 45° on your rifle scope. Plus ROF 10mm riser ($49.46).
- RS Regulate RMR modular upper — $76 — mounts an RMR on an AK side-rail system.
FAQ
My Glock is "MOS" — what does that mean for footprints?
MOS slides ship with a removable cover plate and a set of adapter plates. Full-size MOS (17/19/45) adapts to RMR and most full-size footprints. The slim 43X/48 MOS cut is RMSc-pattern — 507K/RMSc-class optics mount direct; anything else needs a plate like the C&H above.
Open emitter or enclosed?
Open (RMR, 507C) is lighter and lower. Enclosed (EPS, MPO PRO series) seals the emitter from rain, lint, and holster debris — the direction the carry world is moving. For a dedicated carry gun we lean enclosed; for range/competition either is fine.
What dot size should I get?
3-3.5 MOA is the all-around answer. Circle-dot reticles (33 MOA ring + 3 MOA dot, like the MPO PRO) give speed up close and precision at distance — best of both for carry.
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