TEXASforLIFE
SAINT
trying to keep up with various brands and footprints i've found these too be helpful. hopefully these will answer any questions about what you need per optic. i saved these sites for faster referencing if i need. since i ordered the eflx it won't mount on a rmr, but the rfx35 will. hopefully the optic sits/mounts back far enough the ejecting brass won't hit the lens, thus the reason for not mounting the rso on the m/p.
preferoptics.com
lakelinellc.com
inside.safariland.com

Best Red Dot Footprints and Mounting Standards in 2024
Learn about the most popular red dot footprints and how they can help you securely attach your sights on any compatible pistol.
Red Dot Optics Mounting Footprint Guide
Lakeline's guide to mounting your pistol's Red Dot Optic


Mounting Standards: 2025 Guide to Red Dot Footprints - Inside Safariland
Red dot footprints can be confusing. Here's the basic run-down on the most common mounting standards for attaching red dots to handguns.


Red Dot Footprints – A Simple Guide For Handguns
In this guide we will simply explain the pistol red dot footprints that are on the market today. You don't have to be an engineer to figure it out.
survivalstoic.com