an AR should run 400 rounds with just about anything short of gravel as a lubricant.I started using Amsiol full synthetic on my AR about a month ago. It has a high temperature resistance to breaking down and its protection qualities for metal to metal wear are outstanding. I have 400 rounds through my AR without cleaning and it isn't gummed up or slowed down at all. The bolt & carrier snap back like I just cleaned it. I have also known people to use high temp axle grease on their AR's. Say it works great although I have not tried it.