RMR Footprint vs. RMSc Footprint: What’s the Difference?
If you’re mounting a pistol red dot, the most important detail—before dot size, battery life, or reticle—is the optic footprint. Two of the most common patterns are the RMR footprint and the RMSc footprint, and they are not interchangeable. Here’s the quick breakdown so you choose the right optic for your slide.
What Is an RMR Footprint?
The RMR footprint comes from the RMR and is the standard for full-size and compact pistols.
Key Traits
• Larger, wider base
• Two front recoil bosses
• Stronger design for recoil and duty use
• Uses two mounting screws (varies by slide)
Common RMR-Footprint Optics
• Dagger Defense RMR
Pistols Typically Cut for RMR
• Glock 17/19/34 MOS
• Walther PDP
• FN 509
• SIG P320 (with plate)
Best choice for duty, home defense, and competition builds
What Is an RMSc Footprint?
The RMSc footprint (from Shield Sights) is the standard for micro-compact concealed carry pistols.
Key Traits
• Small, narrow mounting base
• Allows low-profile mounting
• Designed for slim EDC pistols
• Screw holes closer together
Pistols Cut for RMSc
• SIG P365 series
• Springfield Hellcat
• Glock 43X MOS / 48 MOS
• S&W Shield PluS
Perfect for slim, lightweight carry guns.