Just chrono'd about 60 rounds today. I noticed that when I pulled the gun out of the gun rug at home it was wet around the outside of the forcing cone. Probably blew out from the interface of the barrel where it fits into the frame. All it took to clean this part was wiping with a dry patch and I had clean stainless steel. I was wondering if Fireclean would repel the lead buildup under the forcing cone that all revolvers get on the frame from the molten lead "splatter" that happens before the bullet has fully entered the barrel. The cylinder on a revolver is a pretty harsh envirnment for a bullet. Until the bullet makes it into the barrel it has some of those hot gasses blasting past it and doing that whole "cutting torch" thing on it. The burning powder gas blows it out of the barrel/cylinder gap all over everything. I can't state that it does prevent this buildup entirely, but it does seem to help some. I fired about 500 rounds of plain uncoated cast lead bullets in a couple of matches, load testing, etc. This area didn't grow a whole lot after cleaning and "treating" with Fireclean and cleanup was definitely easier than any other CLP lube I've used except for Frog Lube, and in comparison I'd call it very close to a draw between the two. I'm fairly certain that there is something to the carbon blocking properties they claim, but I'll also admit that my revolver probably isn't the best test bed. My gut tells me that on parkerized steel and anodized aluminum it's going to work pretty well if you keep at least some wet film on the surface as evidenced by what I saw on my forcing cone today. That's pretty hard to do on a stainless revolver but the porous anodic coating and park'd steel will keep the product there far longer, at least that's my theory. Now I've got to try it out on my ARs because curiosity is killing this cat...