Red Dot & RMR Sights For Dangerous Game Rifles

[Mark A Ouellette]

Great info Mark. Can you who makes a mount for a Heym 89b double. I would like to try one of the Trijicon SRO.

Mark does anyone make a “footprint chart” for all of the different sights?

I covered your questions in my post but aging eyes like mine sometimes miss the fine print.
Here you go:

JJ Perodeau https://jjperodeau.com/ can mill your double rifle’s rib to accept these mounts.

Any skilled machinist could mill a rib for an miniature red dot sight. I however wasn't going to take any chances with my Heym 88B so I sent it to JJ Perodeau https://jjperodeau.com/ .
Later I acquired a couple Merkel 140AE's. I showed the Heym to my retired gunsmith, a very experienced and talented master of his trade. I ask if he could mill the ribs on the Merkels. His response was in no uncertain terms, "Yes, those will be easy. That will be pretty simple machine work". This man has build many custom guns including all metal and stock work. What I'm trying to say is that even though my local gunsmith is a master of his trade, I still sent my first double to JJ Perodeau who specializes in gunsmithing on double rifles. If you have any doubts, DO NOT let just any gunsmith or machinist touch your double!

Trijicon SRO mounted on a Heym 88B

Trijicon SRO/RMR 14-16mm (wide rib) mount available on Amazon:
https://www.amazon.com/dp/B004W59ZL4?psc=1&ref=ppx_yo2ov_dt_b_product_details
This mount is made by Trijicon. I think JJ Perodeau has or had similar mounts for the Docter sights.

RMR mounting Compatibility

There is no standardization of mounting interfaces in the Reflex and RMR industry! The best Reflex or RMR won’t do you any good if you can’t get the right mount for your rifle!

This is a good guide for RMR mounting compatibility:
https://www.cz-parts.com/cz-red-dot-plates-mounts-compatibility-guide

For our overseas friends with limited Internet bandwidth, here is the meat from the above listed red-dot-plates-mounts-compatibility-guide:

Most red dots share the same few footprint standards:

• Trijicon RMR footprint standard,
• Vortex Venom footprint standard,
• C-More RTS / STS footprint standard, and
• Shield RMS / SMS footprint standard

In this guide we will find out which red dot plates (for "optics ready" models) and which red dot mounts (for standard models) can be used for which red dots.

Trijicon RMR footprint standard

Trijicon RMR shares the same footprint with following red dot models:

• Trijicon RMR
• Trijicon SRO
• Holosun 407C models
• Holosun 507C models
• Holosun 508T models
• Riton X3 Tactix PRD
• NcStar VISM FlipDot Pro

Vortex Venom footprint standard

Vortex Venom shares the same footprint with following red dot models:

• Vortex Venom
• Vortex Viper
• Pilad 1x20
• Burris Fastfire 2
• Burris Fastfire 3
• Noblex Sight C
• Noblex Sight G
• Noblex Sight II
• Noblex Sight III (I believe the Docter sight uses this but one must verify that for themselves!)

C-More RTS / STS footprint standard

C-More RTS / STS share the same footprint with the following models:

• C-More STS
• C-More STS 2
• C-More RTS
• C-More RTS 2
• Sig Sauer Romeo 3
• Sig Sauer Romeo 3 Max
• Sig Sauer Romeo 3 XL

Shield RMS / SMS footprint standard

Shield RMS / SMS share the same footprint with the following models:

• Shield RMS models
• Shield SMS models
• Leupold Delta Point Pro
• Sig Sauer Romeo Zero
• Swampfox Sentinel
• Vector Optics Frenzy-S

There are other red dot compatibility charts available on the Internet.
This one provides the engineering drawing for the sight interface:

Footprints/Mounting Standards on Red Dot Sights - Optics Trade Blog

In this article, the most common footprints/mounting standards used on red dot sights are listed. Each standard is described and an image of it is added.

www.optics-trade.eu

If you have any concerns if your sight will fit a certain mount, do the research using this link!
You can see the sight mounting interface (bolt pattern) for (almost) all the red dot RMR-type sights.

Docter Sight Mount Interface

If all else fails, or one just can't get any other mounts in your country, one can always use Plan B, a Picatinny Rail mounted to the gun's rib with 4 screws. Not my first choice but it works!

There are plenty of mounts available for various sights mounting to a Picatinny Rail:

Picatinny Rail

HOLOSUN HS510c Reflex Red Dot Sight + HM3X 3X Magnifier Combo Set​

*** Notice that this sight has a Quick Release mount for a Picatinny Rail
- I don't want a Picatinny Rail on my double rifle but I would use it if my eyes needed an optic sight and it was the only type mount available.

Okay, this is a ton on unedited information. I hope it help my AH friends!

 

[bassasdaindia]

Excellent post , well done
I went through the exercise and settled on the Aimpoint for my 458 Lott , I shoot a lot of 9mm competition and my 9mm‘s mostly use trijicon.

 

[Kevin Peacocke]

This is as low a mounting of a Trijicon RMR you can get. This is fitted to my Heym 89b and the base of the sight sits literally 1mm above the rib. There is no need to lift your head in the slightest, with f cheek weld the red dot is right there in the window.
The base is a Henneberger HMS uni-rail 6-10mm for Trijicon. You have to mill out the base groove from 10mm to 12mm and drill and tal two small attachment holes on the rib. Very neat and tidy, and very strong and stable.

 

[Frederik]

Just an observation over the last almost two years with reflex sight Trijicon SRO specific.
When you get it sighted in from the bench then fine tune it from the sticks.

Even though the dot shoots where you aim after sighting it in from the bench your face and cheek when shooting of the sticks is different on the stock and you are close but not spot on.

So for fine tuning your reflex shoot it standing up from sticks I center mine at either 50 or 30 meters.
This might also be that I set my 1 MOA dot at it lowest that I can see in the light which might also be why I see a difference and the difference might be less shooting a 3.25 MOA or bigger.

 

[rookhawk]

This is as low a mounting of a Trijicon RMR you can get. This is fitted to my Heym 89b and the base of the sight sits literally 1mm above the rib. There is no need to lift your head in the slightest, with f cheek weld the red dot is right there in the window.
The base is a Henneberger HMS uni-rail 6-10mm for Trijicon. You have to mill out the base groove from 10mm to 12mm and drill and tal two small attachment holes on the rib. Very neat and tidy, and very strong and stable.
View attachment 517145

Very proper. Best of all, instantly removable without any ugly residual mount.

 

[Rare Breed]

Just an observation over the last almost two years with reflex sight Trijicon SRO specific.
When you get it sighted in from the bench then fine tune it from the sticks.

Even though the dot shoots where you aim after sighting it in from the bench your face and cheek when shooting of the sticks is different on the stock and you are close but not spot on.

So for fine tuning your reflex shoot it standing up from sticks I center mine at either 50 or 30 meters.
This might also be that I set my 1 MOA dot at it lowest that I can see in the light which might also be why I see a difference and the difference might be less shooting a 3.25 MOA or bigger.

I found the exact same thing. I did final setting at 50 yards at lowest 1MOA setting and am quite happy

 

[Hunt anything]

I really like the RMR on my Montana Rifle Company .416 Rigby. Hopefully I’ll get to try it on a buffalo pretty soon. Lots of good information on this post! The reason for the full length picatinny rail is I also have a leopold 1x6 .

 

[VertigoBE]

This is as low a mounting of a Trijicon RMR you can get. This is fitted to my Heym 89b and the base of the sight sits literally 1mm above the rib. There is no need to lift your head in the slightest, with f cheek weld the red dot is right there in the window.
The base is a Henneberger HMS uni-rail 6-10mm for Trijicon. You have to mill out the base groove from 10mm to 12mm and drill and tal two small attachment holes on the rib. Very neat and tidy, and very strong and stable.
View attachment 517145

This is excellent ! Do I understand correctly that this setup only required enlarged side grooves on the rib and two drilled and tapped holes straight down into the rib, one front and one aft of the optic?

 

[rookhawk]

This is excellent ! Do I understand correctly that this setup only required enlarged side grooves on the rib and two drilled and tapped holes straight down into the rib, one front and one aft of the optic?

Zero Screws involved in such a mounting system, VertigoBE. If you think you see screw slots, they are not really there. Those would be witness marks for centering a rear iron sights. An RMR mount on a double rifle is just clamped to the rib.

 

[Mark A Ouellette]

The link below is to the website for the Henneberger HMS mount for a Trijicon RMR. Unfortunately is clearly shows the two screw holes that @Kevin Peacocke mentioned. It is not a quick release but its a pretty slick setup!

Henneberger HMS Trijicon RMR Mount for UNI 6-10 mm Rail

Henneberger HMS Trijicon RMR Mount for UNI 6-10 mm Rail

www.optics-trade.eu

 

[VertigoBE]

The link below is to the website for the Henneberger HMS mount for a Trijicon RMR. Unfortunately is clearly shows the two screw holes that @Kevin Peacocke mentioned. It is not a quick release but its a pretty slick setup!

Henneberger HMS Trijicon RMR Mount for UNI 6-10 mm Rail

Henneberger HMS Trijicon RMR Mount for UNI 6-10 mm Rail

www.optics-trade.eu

I’m a bit confused now. This does look like two screw holes. @rookhawk says differently.

@Kevin Peacocke , could you perhaps clarify with some additional pictures?

 

[Mark A Ouellette]

@VertigoBE Gosh, Kevin wrote, (my Quote function isn't working)
"The base is a Henneberger HMS uni-rail 6-10mm for Trijicon. You have to mill out the base groove from 10mm to 12mm and drill and tal two small attachment holes on the rib. Very neat and tidy, and very strong and stable."

Then I post a link to the base showing two screw holes... Hmmm. I guess Kevin and I do not know beans about RMR's on doubles, which we both have.

I usually try to help others.

 

[Dakota Hunter]

I have an extra mounting base for a Trijicon RMR to attach to a Heym 88b if anyone is interested . It’s the same one from Heym USA

 

[geoff rath]

A great thread; well worth keeping it on file.

 

[rookhawk]

I’m a bit confused now. This does look like two screw holes. @rookhawk says differently.

@Kevin Peacocke , could you perhaps clarify with some additional pictures?

That’s not a QD mount as I would describe one. THat one Does have two screw holes in it. I wouldn’t attach that to a double. I’d use the one on the Heym website:

Store

www.heymusa.com

 

[deewayne2003]

Just got a call from Ken Owen; my .470 is coming back from having the rib milled for its mount.

 

[Kevin Peacocke]

I’m a bit confused now. This does look like two screw holes. @rookhawk says differently.

@Kevin Peacocke , could you perhaps clarify with some additional pictures?

The two screws in the holes at the ene on the longitudinal axis go into the holes you drill and tap in the rib. The two holes on the short axis are for attaching the RMR.

 

[Kevin Peacocke]

This is excellent ! Do I understand correctly that this setup only required enlarged side grooves on the rib and two drilled and tapped holes straight down into the rib, one front and one aft of the optic?

Yes, correct!

 

[Kevin Peacocke]

That’s not a QD mount as I would describe one. THat one Does have two screw holes in it. I wouldn’t attach that to a double. I’d use the one on the Heym website:

View attachment 517220

Store

www.heymusa.com

Yes I bought that mount too but the problem was that it adds around 11mm to the height of the sight and the dot was way down with a good cheek weld. The current set up is like mounting a shotgun, well worth the two little drilled holes.

 

[Kevin Peacocke]

By the way folks, this low profile Henneberger mount only works on the Heym doubles with a Trijicon RMR or other types where the sight attachment screws are wider apart, about 17mm or more, so the screws don't interfere with the Heym rim. It will not work with a Docter or Kahles red dots. The Henneberger base for those exists, it looks similar but is quite a bit smaller in length and width.