As a C-130 pilot in 1987-1992 I had an S&W M56 as my standard issue. That is a 2" k frame with adjustable sights like a M15 except without the grooves on top, the sight was smooth. I loved that revolver and have a M15 2" as my keepsake now. I believe AF destroyed most of the M56s making it very rare and expensive.
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