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HAWKTECH - Aeroshell 33MS
This is what the big boys use to build AR’s (Aeroshell 33 MS) grease. It’s Milspec and recommended by the people who wrote the AR 15 armorer’s manual. If you are buying AR parts to build your own custom AR and want to do it the correct way to prevent later catastrophic damage to the upper and barrel nut, grab a container of this stuff and swipe some on the barrel nut, upper threads and on the buffer tube threads to prevent galling. It works great and makes the project go together more easily too. It’s inexpensive insurance to ensure thousands of rounds of safe operation and when you have to replace a barrel, try a new one, or change buffer tube, you know that they will come apart like they’re supposed to.
Highly desireable but hard to find Military Grade 33MS AeroShell Gun Grease. If you are going to assemble it or maintain it, then do it right. A little goes a long way, about .25 ozs of a jar should be enough to properly lube, seal and protect around 5 rifles.