Quote Originally Posted by tiriaq View Post
Further to our previous discussions, my '50's receiver more closely resembles the one in the photo, rather than the '49 illustrated. Go with Parked for your survey.
I was going to use the 92L0 that I had access to, but the owner has used a B-Square (non-gunsmithing) mount which has worn/thinned some blueing away around the ejector screw.

I'm told by those with a lot of finishing experience (and experimentation) that the "greenish" tint to the parkerizing is a product of a "chromic acid" bath upon removal from the park tanks.

I believe this was done to stabilize the reaction before/instead of using water.