While Buck Knives boasts about the rust and corrosion resistance of its entire product library, there are certain factors that lead to slight differences in these properties between different model numbers. The most important factor, of course, is the steel type. Generally speaking, the 420J2 is going to feature a more rust-resistant blade than the 420HC, but with a little bit of common sense maintenance and cleaning, rust isn’t something that you should have to worry about at all.