RE: Copper foiling
MT me too. I usually leave em fouled for a month. I am not saying you will get damage for a month. What I am saying is the guy that goes shooting and then 2 years from now takes his gun out. I buy up alot of estate guns, and you won't believe how many people put away guns for years without looking at em.
Most of the pitting I have seen is on pistols. People usually shoot alot and don't clean.