exactly what I needed! thanks. I have an original for the stockmaker to use as a pattern. what gauge steel do you think your material was?

I'm cleaning and de-bluing the receiver and parts this weekend. I tested some 1903 bottom metal with evapo-rust and it it seemed to work well. These parts had been refinished by someone with a very thick layer of dark straw collored bluing. The evapo rust turned it into a black, loose velvety slime that then scrubs off easily with brush, fine wire on a dremmel, cloth, etc. It leaves the underlying metal a bit grey in color, but that goes away when scuffing the surface for final prep. The directions on the evapo-rust state that dark-greying is normal on high alloy or high carbon steels as the chelating process pulls the residual carbon out of the rust layer (not from the underlying metal) - the rust is dissolved in the solution but the carbon remains on the surface - this is why the "rust" turned to black velvet in my experiment. The carbon kind of stains the surface metal after its scrubbed away, leaving the greyish color wherever the bluing was removed, There was no color change or darkening on the areas I already sanded and polished. I should take pictures.