Any store the sells KLEEN-BORE PRODUCTS should have their LEAD AWAY patches or cloths. It's a moist patch you push through the barrel wait a while repeat, lead is gone. How effective depends on how badly leaded. Also a 50/50 mixture of white vinegar and hydrogen peroxide will work . It may effect bluing so don't soak a barrel in it for hours. I did a blued cylinder ,it removed the lead and didn't bother the blue but I soaked it in hot water and baking soda to neutralize the acid , then very hot water to wash and dry, then oiled . IT WORKED FINE.