Unless I was told wrong by a master gunsmith, all the machine screws are Whitworth.I have never found an exception unless it was a replacement screw. An early set from CSMC were close,would thread in, but were not correct, do not know if they ever changed that in later screw sets?
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 "Double guns are a sport and a pastime built into a beautiful package to which I attach myself when entering the great theater of autumn, those days now grow more precious because we are given so few".. Robin Lacy
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