Three barrel game gun? Heck, Charles Lancaster started making 4 barrel hammerless guns in 1882. Workable design where the hammer rotated and the barrels and action were static. Later ones had a trigger that was pulled by the middle finger to cock the hammer and another trigger pulled by the index finger to fire it. Kind of a under lever opener. It had a square shape with two barrels on top and two below.
Boss came out with their 3 barrel gun, all in a row like the picture, in 1898. It was a single trigger design, so they figured it out early. I suppose a lot of the others tried the designs too, probably just to say they could.
Autos weren't really an option when they were brought out.
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