Thanks for the reply! I too kind of doubt it's original 3" chambers. I have a return privilege yet I'm going to see if the seller will let me hold onto it until I get my research letter. I did search this forum and found references to chamber end wall thickness at the forcing cone juncture listed in the range of .080"-.100" as typical for vintage doubles.
Does anyone here have a letter confirmed factory 3" Parker that they could measure the wall thickness of the chamber end/forcing cone juncture?
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