re: Rust removal from gun?

Order a Big 45 Frontier metal cleaner pad and use with some Breakfree CLP. Let the CLP soak on the rust for a day or so before starting.

LINK

You will get suggestions about steel and brass wool. Both will work to some extent, but Big 45 is the best for light rust.

For heavy rust, crush the mouth of a brass rifle or handgun ammo case and use it as a scraper in conjunction with CLP.

NOTE: Loose rust particles floating around in the oil can scratch bluing.