Using a borescope and possibly other equipment, he and his team discovered that using a mechanical means to get copper fouling out of a barrel exceeded that of the chemical variety. He gave an excellent presentation on cleaning a rifle barrel. I attended one of Bryan Litz's seminar last year. There was no reaction, but it made a suspension and wouldn’t incorporate. I did some small batch experiments with adding pure ammonium hydroxide, and it did not work. I make my own Ed’s Red and add acetone, Kroil, and Lanolin. If it's really bad put the purest ammonia you can find down the barrel, let it sit for an hour or two, and then brush all the residue out, and then hit it with WD40, not as a lubricant, but as a desiccant. Pure ammonia is THE most effective way to cut copper. It reacts with the copper and creates a water soluble compound.
Pure ammonia sitting in a plugged barrel works best, and totally dissolves copper, but you Have to get it from chemical supply, as 99.99% of what’s out there is not pure ammonium hydroxide, but has a ton of water and other stuff in it. The active ingredient, as was pointed out, in Sweets is ammonia. I've also never had Sweets pit a bore, and I've left it in overnight on a new to me used barrel, and the Hawyeye showed no damage from at least 20hrs. I used to scrub mirror finish, steel regulator housings with a brass toothbrush, and it would leave no marks discernable to the human eye no matter how hard you scrubbed. Click to expand.A brass brush will not leave the slightest mark on steel.
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