Common 1911 Optic Footprints
Trijicon RMR / SRO: The industry standard for full-sized handguns; most popular for traditional 1911 rear-dovetail adapter mounts (like EGW mounts) and larger slide cuts. Used by Trijicon, Holosun (407C/507C), and Swampfox.
Shield RMSc / Holosun K-Series: The dominant ultra-slim footprint.
Increasingly common on modern direct-milled 1911 slides because the 1911 slide is too narrow for standard wide-body optics without custom milling.
Leupold DeltaPoint Pro (DPP): Frequently utilized on high-end tactical or competition modern 1911/2011 variants (such as Staccato).
Docter / Noblex / Vortex: Frequently found on older or mid-range red dots (Vortex Venom/Viper, Burris FastFire) mounted via universal 1911 plate systems
Thanks, crazy how easy it is to find answers to most questions these days.... we won't need each other's brains to pick soon!
I thought mabye the DPP was better suited for narrow frames but it looks like it's better for wider and offers a wider window.
LLM, answer,
For a typical 1911 slide, the
RMSc (Shield RMSc / Holosun K-series / JPoint) footprint is widely regarded as the best choice for a custom-milled optic cut.
Why RMSc is the go-to footprint for 1911s
- Slide width match: The 1911 slide is narrow—about 0.92 inch wide. RMSc-class optics are compact and align well with that width, giving a flush, clean look without excessive overhang.
Optic selection: There are many excellent RMSc-compatible optics (Holosun 407K/507K/EPS Carry, Sig Romeo-X Compact, Shield RMSc, Trijicon RMRcc), covering a range of budgets and features.
Low profile: Direct-milling to RMSc keeps the optic as low as possible on the slide, which helps with holster fit and sight picture.
Other viable footprints
Depending on your goals, these are also common on 1911s:
- RMR (Trijicon RMR / Holosun 407C/507C): Great if you want maximum durability and the widest optic selection, but these are wider than the slide and will overhang slightly. Often chosen for competition or duty-style builds.
DPP (Leupold DeltaPoint Pro): Popular on some custom 1911s for its wide window, but the footprint is less universal than RMSc/RMR.
Proprietary systems (e.g., Nighthawk IOS): Excellent if you’re buying a new slide or gun built around that system, but not ideal if you’re milling an existing generic slide and want flexibility.
Practical rule
Pick the optic you actually want to run first, then have the slide milled to that optic’s footprint (or to a plate system that matches it). There’s no single “1911-only” standard—RMSc just happens to be the best physical and practical match for most builds.
If you tell me which optic(s) you’re considering (e.g., Holosun 507K, Trijicon RMR, etc.), I can suggest the exact footprint name to give your machinist and any notes on co-witness or plate options.
