Dunno. Haven't checked.

I do remember being told that there was originally some consideration of making a Scandium aluminum alloy 4003TSW for the CHP, but the decision was made to remain with the stainless steel frame.

A Scandium aluminum alloy frame would've made for an interesting variation, offering both light weight as well as some increased strength. Too bad it didn't come to fruition. Probably would've been expensive, though. I've been told the cost of the Scandium aluminum alloy frame was the cause of the 4040PD being discontinued.

I liked the 4003TSW I handled and used for T&E.

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Ret LE Firearms inst & armorer