I don't remove copper fouling in my ARs more than every 1000-1500 rounds.
Sweet's works quite well, but I find the Outer's electro-chemical "Foul Out" system better. It also removes the leading in my handguns.
I didn't fight to defend your freedom so you could vote to take away mine.
"A man who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself.
John Stuart Mill."