Rusting is probably because Slidell is on the Gulf of America coastline where the air is full of salt and TN air is not salty.I grew up in S.E. Louisiana and we cleaned our guns. I'm not saying after every use, but we "oiled the outside" well enough to keep the rust from forming. 100% humidity in the TN Valley is NOT the same as 100% humidity in Slidell, Louisiana, trust me. I will say that old habits are hard to break, especially when it comes to cleaning a weapon.