the barrel was draw filed and polished up to 320 grit then degreased with denatured alcohol then I used brownells oxpho blue and burnished it back to a nice grey with 0000 steel wool. I did that twice to get the color I was after. The lock and all other parts that were not brass were filed and polished to 220 and scotchbrite pad then degreased and “temper blued” this was done by use of a propane torch and quenched in oil when the desired color is reached which is 590-610 degrees. As bright polished steen is heated it changes color. And from reading the master Dave persons posts about the traditional ways of metal finished he talks about temper blue a lot and from what I’m led to believe this was a traditional way of finishing parts after they were case hardened and then polished back to bright white and either left white or they were temper blued. I did this to all metal parts and screw heads and only on the very bottom on the frizen as I did not want to change the temper on the actual striking surface of the frizen.