Does anyone have specific insight in the specifics of the aluminum alloy used on the lower frame of 3rd Generation Autos?

Specifically, 6906, 3913, 5903, etc. I have a few beaters with signifignant wear and scratches. I have an offer from a local plating and coatings shop to do some custom anodizing work as long as I do the prep.

I need to know as much about the alloy and metallurgy as possible. Does anyone have any input? Thanks.

Beuhler?

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I believe that the specific alloy S&W uses is proprietary.

I'm guessing 7075T6.

Without placing the sample in a scanning electron microscope and performing energy dispersive x-ray tests, obtaining the alloying elements is likely impossible. There are a number of threads on the refinishing of alloy frames at SIGforum.com --A discussion forum for SIG enthusiasts, and some cautions about prep work.