The fire blued parts like the bolt stop, safety lever and trigger can be done in molten sodium nitrate salt. Not sure if that is available where you are but over here you can get it at food preservation supply houses. Its used as a preservative in some meats and such as that. Most guys I know use it for annealing the necks of their brass cases. They use one of the electric lead melting pots with a controllable temp knob. I can't recall exact temps but there are charts out there. Look up tempering colors. You melt the salts and take them to the temps you want and then dip the parts in until the color is achieved. You need to polish them before hand to remove any prior finish. It is the way the parts were originally done. Dip them in oil to retain the color.
Frank
|