What amazes me is how a simple tool, a (button cutter) guys could build rifle barrels.
Long before the button concept, barrel makers had been pulling a steel burr through a bore in many passes, cutting one groove at a time, using wooden and bronze tooling. Today, button and now hammer forged barrels are made by the millions, but single point cut rifled barrels rule the roost for internal precision, accuracy and long life....
See Krieger and Obermeyer Bartlien etc on the web. Oh, by the way, it wasn’t until the advent of the M16 series that US military rifle barrels were made by other than cut processes. IE, all US M1 and M14 and MG 30/762 to 50,plus most all cannon & gun tubes.
I had the pleasure as a teen to tour Watervliet Arsenal in NY and watched with amazement as a 155 gun tube was cut rifled on a 200 foot long rifling machine....
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