I do that exactly, FG. I have gotten rust on the inside of my barrel so I oil it for that reason. I make sure I swab it out whenI am gonna shoot though.

For rust, I just took some Triple O steel wool and some Rem oil. I sprayed the Rem oil on the rust--very heavily, and lightly used the steel wool. It worked great on the outside rust. The rust in the barrel should come out with the oil and brush, like I said. That's the only way I know of.

Thanks for the advice, FG.