Aeroshell 33ms Grease for AR15 Barrels

Zee705

Zee705

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Is this stuff absolutely necessary for mating the barrel to the upper receiver? I know it's Mil Spec.

Is there an equivalent off the shelf grease that I could use?

https://www.amazon.ca/Aeroshell-MIL-G-21164D-MIL-SPEC-Barrel-Thread/dp/B01BJ3HE0K

$15 for 1/2 oz
 
I have bought this exact item off amazon to replace a barrel on one of my rifles, there is enough there to do 3 or 4 rifles. The grease is also great for your buffer and spring assembly.
White lithium grease will be fine, but this stuff is the best.
 
As a CF armourer our books only states to use molybdenum disulfide grease on the threads of the upper receiver and the threads on the inside of the barrel nut. Even though our books doesn't say anything about the barrel extension and the receiver, as a general rule we still apply a bit of anti-seize around the smooth surface of the barrel extension so that it doesn't stick in there too hard if we ever have to replace the barrel in the future.
 
-[Crosshair]- said:
As a CF armourer our books only states to use molybdenum disulfide grease on the threads of the upper receiver and the threads on the inside of the barrel nut. Even though our books doesn't say anything about the barrel extension and the receiver, as a general rule we still apply a bit of anti-seize around the smooth surface of the barrel extension so that it doesn't stick in there too hard if we ever have to replace the barrel in the future.
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Grease will not stay on the barrel extension as it gets too hot. I use Indian Head gasket shellac compound to make the fit as tight as possible on the extension to receiver, tighter the better.
 
If you know anyone that wrenches on Aircraft, see if they've got any tubes of 33MS that are time-expired.

A lot of the time the old consumables that can't go on aircraft anymore just get tossed out or go to the bottom of our home toolboxes.
 
ESTRADA said:
Grease will not stay on the barrel extension as it gets too hot. I use Indian Head gasket shellac compound to make the fit as tight as possible on the extension to receiver, tighter the better.
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I wrote that we use anti-seize on the barrel extensions, not grease. Anti-seize is rated for high temperatures. Considering we anti-seize on the muzzle brakes of M242 Bushmaster 25mm guns, it's safe to assume that it does fine on a 5.56x45mm rifle.
 
Copper anti-seize that ##### up. Even the pros don't have access to the "correct stuff" most of the time, they use copper anti-seize instead. Permatex Copper or Loctite C5-A.


And please, don't listen to someone who is suggesting you to use just any moly grease, the vast majority of them contain graphite as a primary ingredient, with very little moly. You don't want that.
 
Using copper containing anti-seize on aluminum parts is a huge no-no due to galvanic corrosion concerns.

Finding any of the milspec greases for this task is very difficult right now. Aeroshell 17 was discontinued years ago. Aeroshell 33MS is discontinued but can still be found here and there. It will be replaced with Aeroshell 64 sometime, but none has been allocated to Canadian distributors, yet. An aircraft supply outfit with Canadian and US operations is selling it, probably by transferring it between warehouses, they are the only ones.
 
BattleRife said:
Using copper containing anti-seize on aluminum parts is a huge no-no due to galvanic corrosion concerns.

Finding any of the milspec greases for this task is very difficult right now. Aeroshell 17 was discontinued years ago. Aeroshell 33MS is discontinued but can still be found here and there. It will be replaced with Aeroshell 64 sometime, but none has been allocated to Canadian distributors, yet. An aircraft supply outfit with Canadian and US operations is selling it, probably by transferring it between warehouses, they are the only ones.
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Yeah, I heard anti-seize and graphite greases were a no-no.

Nickel based anti-seize may be a different story?
 
I just ram it in there dry... oh wait, what were we talking about again? ;) lol.
I've never had a barrel stick and I don't lube them with anything. I'll see if I can find some 33ms at work for the next upper I put together.
 
I am just going to mention that moly marine grease is probably the easiest to find (nation wide) grease intended for assembly of dissimilar metals including aluminum in harsh environments.
 
There is no end to the ridiculous snake oil products revolving around the AR15 platform to separate idiots and their money.
Just find a buddy who is a mechanic or works in a shop, get some cheap ass permatex aluminum anti seize. It's silver in colour.
I think its like $14 for 8 oz if you buy it at Can Tire.
The whole purpose of the anti seize on the barrel nut threads is so that you still can easily remove the barrel at a later time if you should choose to or if it's shot out and needs replacing. That's all. It prevents the threads from seizing and corroding to the receiver.
$15 for 1/2 oz. Must be some magical anti seize that also makes the bullets go faster! Surely it must be light years ahead as a composition. Brewed from unicorn urine and leprechaun tears at the highest peak of mount Kilimanjaro. Save your money for ammo Sir.
 
BattleRife said:
Using copper containing anti-seize on aluminum parts is a huge no-no due to galvanic corrosion concerns.

Finding any of the milspec greases for this task is very difficult right now. Aeroshell 17 was discontinued years ago. Aeroshell 33MS is discontinued but can still be found here and there. It will be replaced with Aeroshell 64 sometime, but none has been allocated to Canadian distributors, yet. An aircraft supply outfit with Canadian and US operations is selling it, probably by transferring it between warehouses, they are the only ones.
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I have a tube of 33MS I bought several months ago at Cox Aviation supplies (Oshawa,Ontario) and was a dearly 35 bucks with tax. I would also buy and use any high moly content/high temp grease which comes in many forms cheap but Locktite nickel antiseize is rated to 2399*F and stated good for many materials including aluminum. On a side note I have started a test (4 months in) on Locktite Marine grade antiseize (2400*F) on the emission systems of heavy trucks as heat is in the 1300*F range and components are also exposed to water, salt, and calcium and seize severely and the marine grade is supposed to be their best product under these circumstances. Recently after 4 months I was able to remove the temperature sensors with normal effort and without damage but more time over a winter will be the ultimate test. Unless your an Navy seal I would think the Locktite Nickel Antiseize would be the best, easiest and cost effective route for barrel threads but as with any antiseize a slight reduction in torque might be required as antiseize compounds do reduce friction under some circumstances and in that regard the moly grease route might be best as stated in armorers instructions--Dieseldog!
 
dieseldog said:
I have a tube of 33MS I bought several months ago at Cox Aviation supplies (Oshawa,Ontario) and was a dearly 35 bucks with tax. I would also buy and use any high moly content/high temp grease which comes in many forms cheap but Locktite nickel antiseize is rated to 2399*F and stated good for many materials including aluminum. On a side note I have started a test (4 months in) on Locktite Marine grade antiseize (2400*F) on the emission systems of heavy trucks as heat is in the 1300*F range and components are also exposed to water, salt, and calcium and seize severely and the marine grade is supposed to be their best product under these circumstances. Recently after 4 months I was able to remove the temperature sensors with normal effort and without damage but more time over a winter will be the ultimate test. Unless your an Navy seal I would think the Locktite Nickel Antiseize would be the best, easiest and cost effective route for barrel threads but as with any antiseize a slight reduction in torque might be required as antiseize compounds do reduce friction under some circumstances and in that regard the moly grease route might be best as stated in armorers instructions--Dieseldog!
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Thanks for this.
 
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