I am fairly new to the AK platform, have only been using them for about a year. I was shooting inside so I was forced to use brass cased arsenal ammo in the past. I'm now shooting outdoors and have been shooting a mixture of different steel cased ammo. On my last trip I was shooting a lot of wolf polyformance ammo. When cleaning right after shooting I noticed a lot of the patches were coming up brown colored after I got rid of all of the black carbon. I have no experience with rust on any of my firearms so I'm not sure what I was looking at. There was absolutely no visible surface rust on any parts of the gun, but the patches were coming up really brown. Is this just due to the ammo being dirty, or is this rust on my gun from shooting this kind of ammo? like I said absolutely no visible surface rust, just brown cleaning patches. Sorry for the lack of pictures, I should have thought to take some. Next time I go I'll be sure to take some. I'm fairly OCD and want to care for my guns properly. I've been using ballistol to clean post shooting. Any advice/info would be greatly appreciated. I'd love to put my worries to rest.