Since everyone seemed to miss this: Positive material identification - Wikipedia, the free encyclopedia
Positive Material Identification (PMI) is the analysis of a metallic alloy to establish composition by reading the quantities by percentage of its constituent elements. Typical methods for PMI include X-ray fluorescence (XRF) and optical emission spectrometry (OES).
I used to work in a machine shop and have to send samples off for PMI testing.. though even in that environment I don't know whether the testing is destructive. It'd be interesting to see how Marlin/TG compare to OEM.. especially if it didn't require eating the cost of each of the gears just for the data.
Edit: also, will PMI tell us anything about heat treatment? or just the alloy itself?
i have a set of stock gears and marlin gears, Ill run by a couple shops I know in town and see if someone will do a quick under the table job for a case of beer for me! Than atleast we have a baseline
no it wont mention anything about the heat treatment, but will be able to tell the metalurgy which can start to tell you where it was made, as china metal is slightly different than japan and USA
most are XRAY now