[targa911S]

Originally Posted by DAEpperson

I know u blued the barrels, but what is that finish on the trigger area?

The trigger guard itself is rust blued like the barrels. The rainbow color of the receiver and side plates is a bi product of case hardening those parts, Case hardening is like giving the metal parts an exoskeleton like shell to protect it from wear. It is a traditional process used on guns in this era, and fine guns today. The colors are fragile and will wear off in time from carrying and UV exposure.