One of the features Mark noted for my gun that was ordered in "Trap Configuration" was 2 5/8" chambers were specified. This was my first research letter where chamber length was mentioned. Again the gun is from 1928. I am guessing that 2 3/4" 12ga was available at that time but had not become standard and the person ordering the gun wanted shorter chambers for performance reasons or planned to shoot 2 5/8" loads.
Chamber length for awhile was another variable for "trap" guns or so it appears.
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