There have been a number of articles regarding AR barrel break in procedures reducing copper fouling forward of the gas port. Damn AMU, at it again.
With any firearm your barrel temperature is more important than any friggin copper fouling.
People can do all this mumbo-jumbo if they are trying to squeeze 0.1 more MOA from a benchrest rifle. And those people are worrying about gunpowder temps impact on accuracy in their handloads. Are we?




















































