Saw a picture of an interesting military with cf scales, which looked amazing. The steel on the blade was just a number, 52100. Found some information and videos on youtube. I learned that it is a carbon tool steel which is also used for bearings and forged blades, but it seems to be very susceptible to rust. I like patina on blades, but rust? Could it even have some negative affect on the spydie mechanism? Would be interested if anyone has some experiences to share.