My eyes have reached an age where "focus on the front sight" is a fond memory from the past. Shooting glasses work, but aren't going to be on when I'm out on daily business. It's time to admit reality and make the switch to a RDS on my bedside and carry guns.

It's been a few years since I looked into them, but there sure are some very nice options. Trijicon is no longer the only game in town. Unfortunately, it seems that different manufactures have either come up with their own mounting pattern or at least their own name for a semi-common platform (What the heck is a "Holosun K"?)

I am hoping someone knows of a compatibility chart that basically shows what is equivalent and what fits.

FWIW: I already have a Sig M17 (black commercial version), a G19 MOS and have ordered an optics ready slide for my P365. I'm willing to sell, trade, mill as necessary to get the best fit and selection.

Thanks for your help and and advice on mounting adapters, shops for milling, etc is also appreciated.

Mike

You will like this. It’s an adjustment but once you do I bet you will be happy. The Holosun K’s are the “micro” optics for micro compacts. Basically the footprint is the Romeo Zero, the 407/507k’s, and the RMSc. The Trijicon RMRcc is in this class but has its own footprint which is part of why nobody is buying them (relatively).

If the 365 is optics ready, anything in that category (except the RMRcc) is a direct mount to the slide. No plate, no milling needed. All the 365X slides are cut already. I’ve played with all of these and the 407/507k is best of breed in my opinion. The 407k is cheaper because it’s the same optic but no reticle options, just a dot while the 507 gives 3 reticle options if you want that. It’s a great optic. If it wasn’t made in China I would say it’s about perfect.

No chart but maybe that helps. I ended up with 2 of them. One on a 365 and one on a 322.

Thank you. I know what you're saying about China, and I generally try to avoid their products, but not sure it makes sense in this case. I'd gladly spend the money on a RMR or DPP if they weren't on a dang proprietary footprint. This seems to be kind of like the VHS vs BetaMax fight of the 1980s. Sony had a good product, but absolutely refused to adjust as VHS took over.

Trijicon screwed the pooch on this one (RMRcc). They bet the farm (my supposition) on the RMR mystique failing to recognize that the actual performance gap has basically disappeared. I’m talking to you Surefire. You can pay extra for the Trijicon but you end up with the lesser optic in most categories in the micro class. I would guess RMRcc is the most robust sight but that’s really just an assumption without nothing to really back that up factually.

I hate admit it but I think the Holosun is the actual better product. That hurt me to type that. Lol

This is the most recent compilation of red dot compatibility I know of:

8/21 American Rifleman

If you're going to use a pistol optic for self defense I'd strongly recommend looking at the Holosun 507 models with Red or Green ACSS reticle. I rarely shoot iron sight pistols these days and I've mostly transitioned to the Green ACSS. It's pretty much impossible to get lost in "fishing" for the dot and massively accelerates adopting, transitioning from iron sights to using an optic. Not only using it but betting your life on it.

They're basically all proprietary. Even cuts that are "the same" are not always "the same."

The RMR (not CC) footprint is shared by the Holosun 407C, 507C, and 508T as well as some Swampfox optics. I have no experience with Swampfox, but the Holosun optics generally fit the RMR cut fine, HOWEVER the tolerances in dimensions with Holosun seem larger and you may find minor fitting required.

The Deltapoint Pro footprint is shared by the Romeo 1 Pro (but not earlier Romeo 1s) and the new EOTech EFLX (although I have not seen them in the wild yet. The screw pattern is the same as the RMS and RMSc cut below, so a thin plate that merely indexes the optic while allowing the original screw holes to be used will adapt compatible optics to it.

The RMSc/507K footprint is a troublesome one. The original RMSc footprint has four recoil lugs while the Holosun K only has two, and they're shallower. According to Holosun, this was unavoidable in the 507K due to water resistance standards they were trying to meet. Generally you can either modify the existing cut by filing or milling the recoil bosses or buy a plate to put a 507K on the cut, just slightly higher. Note that Sig's factory 365X/XL cut is 507K compatible. The newly released Holosun EPS Carry also uses the 507K version of this cut.

The Aimpoint ACRO cut is alleged (by Steiner) to be shared by the Steiner MPS, however there are differences in the cut and the prevailing thought is that they should not be shared in a duty or defense application. The plate makers have MPS specific plates out now.

The Holosun 509T cut is proprietary and not shared by any other optic.

Those five cuts comprise the lion's share of the market right now. I believe there is some Vortex stuff that uses either a proprietary cut or MAYBE shares something older (like Docter/Noblex) and I know Primary Arms' new in-house pistol optic is using the Docter/Noblex cut.

If you have a Glock MOS, there will be quality plates for everything you need. Buy a good plate from C&H Precision or Forward Controls Design and skip the factory ones.

Of possible help—?

https://optics-info.com/footprints-on-red-dot-sights

What dabiggr said. For me it’s easy. I stick to the RMR footprint for big guns and the Romeo Zero/507k footprint for small ones.

On 365’s they drop right on so I don’t worry about recoil bosses.

I tried a Deltapoint and then the Pro. My advice? Trijicon or Holosun. Leupold engineers need a swift kick in the nuts to recage their gyros.

quote:

Originally posted by sigfreund:
Of possible help—?

https://optics-info.com/footprints-on-red-dot-sights

This is a very useful site for those who have not seen it before. It's a little cumbersome and not always up to date but the schematics they have are very helpful.