I have noticed some rust in the barrels of my rifles and I was wondering if I could use this rust remover I got from lee valley to remove it. The stuff is called evapo-rust, its non corrosive, non toxic and it works by the process of chelation. I used it to clean my rusted micrometer sight and my stripper clips when I first got them and it does work. Depending on how much rust there is, it takes from an hour to 24 hours to remove it, I'm just wondering if it would be safe to use on a rifle bore and if so how would I plug the barrel so I could let this stuff work away at it?