Couple of questions: Does anyone know if Remington UMC is fully jacketed or if it has an exposed base? Shot a few hundred out of my 19 the other day, and when I was cleaning it, there is some fouling caused by the ammo that could possibly be lead. The bottom line is I let the barrel soak in Ballistol for at least 2 hours and still can't get the mess out. It could be carbon fouling, but I've never had carbon be as bull-headed as this is. Anyone got any suggestions? I remember reading something about lead away patches, but it appears they've been discontinued. If it is carbon, I guess I'll go buy a brass brush and some old Hoppe's solvent, because the nylon brushes just ain't cutting it. I'm having a hard time believing it's simple carbon buildup, though. I've never had stubborn fouling like this in any of my barrels. Any insight?