Any Issues With Heat Transfer From Ultimak Rail to Optics?and - Shooting Sports Forum


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Old 08-01-2020, 11:07   #1
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Any Issues With Heat Transfer From Ultimak Rail to Optics?

Was reading a thread on Arfcom posted by a M1A Scout user, who was noting his electronic optic got extremely hot when shooting in OEM configuration, using the barrel-mounted Pic-rail.

Suggested to him that conductive heat transfer could be reduced by using an Ultimak rail. Radiant heat transfer could be reduced by painting the inside of the Ultimak with white engine block paint.

Granted, the original (M1A) situation is very different from using an Ultimak, even on the same rifle, but I was wondering if anyone had noticed a build-up of heat in their Mini Ultimak mounts or optics after firing a lot of rds.
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Last edited by RIBob; 08-01-2020 at 12:20. Reason: clarity
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Old 08-01-2020, 15:58   #2
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No, not even a little bit. Zero. Nada. Not only does the optic not get hot, it doesn't even get warm.
Neither does the Ultimak.
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Old 08-01-2020, 16:48   #3
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Originally Posted by sandog View Post
No, not even a little bit. Zero. Nada. Not only does the optic not get hot, it doesn't even get warm.
Neither does the Ultimak.
Same as my personal experience. I >>think<< the solid Pic rail atop the M1A variants might be the cause of the heat-sensitive guts of some electronic optics over-heating. Lots of potential conductive heat transfer with rails directly connected to the barrel.
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Old 08-01-2020, 17:55   #4
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Ditto...never. Have mine on a 186 with a Vortex Sparc, no issues. Just bought another for my 580 and mounted a FF III
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Old 08-02-2020, 19:34   #5
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The Ultimak is a nice hunk of heatsink... another of its many benefits. Helps cool the barrel, but transfers that heat into the air, not into optics or anything else on the other side.
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Old 08-04-2020, 10:17   #6
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My ultimak gets too hot to touch. Will burn your hand if you are not careful- but that's why I wear gloves!
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Old 08-04-2020, 10:41   #7
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Most optics these days use lithium batteries to much heat can make these batteries explode. So now you may be looking thru a grenade.
I have seen the aftermath of a lithium battery going bang and it ain't pretty.
Just something to consider when using these batteries.
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Old 08-04-2020, 12:00   #8
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Originally Posted by Aguy View Post
My ultimak gets too hot to touch. Will burn your hand if you are not careful- but that's why I wear gloves!
Do you have a Mini-14 ? The 14 tends to run hotter, higher pressure round, and an overbore case.
The 7.62 x 39 runs cooler than the 5.56mm, maybe that's part of the reason my Ultimak doesn't get very warm.

Do you do mag dumps ? If you shoot fast enough to get your barrel really hot, you stand a better chance of getting your Ultimak hot as well.
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Old 08-04-2020, 12:50   #9
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Long guns for work are the S&W M&P15's. They are set up with the aluminum pic rail fore end that I don't like. During qual they have you firing two to three mags in a string, non stop with multi round bursts. Barrels get so hot they are smoking. Fore end gets too hot to touch.

Watched a video last year on the "Melt Down" series. Couple of guys fire different weapons ...AK's...AR's...etc until they seize to gt a round count on reliability. One guy was firing an AK. The fore end lit on fire from the barrel heat and was burning with big flames during his firing. A freakin hoot.

No matter what you are shooting...fire it fast and often enough and it will get hot.

Bepe
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Old 08-04-2020, 15:25   #10
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Originally Posted by Bepe View Post
Long guns for work are the S&W AR15's. They are set up with the aluminum pic rail fore end. During qual they have you firing two to three mags in a string, non stop with multi round bursts. Barrels get so hot they are smoking. Touch that front fore end and you will get burned.

Watched a video last year on the "Melt Down" series. Couple of guys fire different weapons ...AK's...AR's...etc until they seize. One guy was firing an AK. The fore end lit on fire from the barrel heat and was burning with big flames during his firing. A freakin hoot.

No matter what you are shooting...fire it fast and often enough and it will get hot.

Bepe
I agree Bepe with your rapid fire assessment. Which is why controlled and aimed fire is the key to accurate and effective fire.
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Old 08-04-2020, 21:01   #11
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The Ultimak will stay considerable cooler than most other mounts due to it's mass. 6061-T6 aluminum is tough, light and good at cooling. It cools quickly compared to barrel steel, and will always be cooler than the barrel itself. But of course everything is going to get hot with sustained fire beyond reasonable use.

Too hot to touch is around 140 degrees F at 5 seconds for the average adult hand. Make that 1 to 2 seconds @ 160 degrees F.

A good scope will be rated for upwards of 200 degrees F. Under normal use you won't see those temps. You'd really have to try to get a scope that hot.

The art of the semi-auto. Just because we can empty a mag as fast as we can pull the trigger doesn't mean we should.
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Old 08-05-2020, 03:36   #12
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melt down

The AK meltdown.

A HOOT.

Can't remember if this is the vid or not but one of them he fires the AK until the barrel melts and droops over. He takes it apart and beats the barrel straight on a bench leg. Puts the rifle back together and continues shooting.

A MUST watch....too funny.

https://www.youtube.com/watch?v=EwSJiAwoMpY

Bepe

It is ^^^^^ watch the entire video. Schumer butts in with an ad half way through. X him out and continue watching.
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Last edited by Bepe; 08-05-2020 at 05:20.
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Old 08-05-2020, 17:02   #13
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Originally Posted by Bepe View Post
The AK meltdown.

A HOOT.

A MUST watch....too funny.

https://www.youtube.com/watch?v=EwSJiAwoMpY
That is a hoot. I followed the link to a few other fire-to-destruction videos. I'll say this though... if I were to get an AK, a Vepr would be on my short list. That thing took some serious abuse before succumbing to the heat.

By the way, I should have clarified in my last post that the Ultimak is one of the better solutions to barrel mounting a scope for scout or forward position, but of course a receiver mounted scope will generally see a lot less heat. And again, I don't use an Ultimak, but I'm still a fan. It's a good product. Sound design.
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