Grease for the Barrel Nut Threads

[Switek]

The TM says to use some Molybdenum Disulfide grease on the barrel nut threads to prevent galling.

Is something like this appropriate?:

http://www.valvoline.com/pages/produ...asp?product=68

[Broadway]

I've used this from Brownell's for years. Never an issue.

http://www.brownells.com/aspx/NS/sto...20LUBE%20PLUS~

[Switek]

Yep, but if I place an order with Brownells, it will be mid-week at the earliest before I receive it.

If I can use some grease from the auto parts store, I can be sighting in my first AR tomorrow.

[chadbag]

I've used the anti-galling grease stuff (silver tube) from the Auto Parts stores without issue in the past. Forget its exact name now. Like what you put on your spark plugs.

[Iraqgunz]

Go the auto parts store and buy some Loc-tite C5-A copper based anti-seize. I use it over here and it works fine.

[LOKNLOD]

Go the auto parts store and buy some Loc-tite C5-A copper based anti-seize. I use it over here and it works fine.

Good stuff.

It's also the "glock copper paste" for those folks who like keeping that stuff on there.

[rob_s]

get the MSDS and make sure it doesn't contain graphite.

[Joe Mamma]

Go the auto parts store and buy some Loc-tite C5-A copper based anti-seize. I use it over here and it works fine.

Yeah, I use Permatex antisieze (the silver nickel based stuff) for a lot of things and love it. Any antisieze compound will generally be better than any plain grease (including Molybdenum Disulfide) for what you are asking about.

The way that antiseize works is that it has powdered metal (generally copper or nickel) in it that normally melts at a very high temperature. It's put into a grease like compound (which acts as a carrier). If things get really hot, the grease burns of but, it leaves the powdered metal which acts as a barrier between the parts.

Joe Mamma

[K.L. Davis]

The theory behind how the barrel nut works, is that as you tighten it... the thread material around the aluminum proboscis that holds the barrel extension, is displaced and forces the aluminum to crush down around the barrel extension...

This is how it was designed, to squeeze down tight on the barrel...

The torque spec is called out for the threads being lubed... I use Moly Grease.

[Switek]

The TM calls for moly grease so I used the Valvoline moly grease pictured above.

I'm not sure on the wisdom of building vs buying the upper for one's first AR, but getting the barrel torqued and the gas tube holes lined up was easier than I expected.

Now, compressing the delta ring spring to put the hand guards on was hard.