DON'T FORGET THE GREASE!

Highly desirable but hard to find Military Grade 33MS AeroShell Gun Grease. If you are going to assemble it or maintain it, then do it right.

This is what the big guys use to grease their AR builds. It's Mil-spec 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.

A little goes a long way, one .25 oz jar should be enough to properly lube, seal and protect around 5 rifles.