Older hammerless guns that have the horns on the back of the hammers, have large Channels cut out in the head of the stock to clear the hammers when they are cocked. This leaves a relatively thin amount of wood on each side of the head. That is why you can not step down more than one frame size in many cases because you chance not having enough material to work with on the sides of the head.
Hammer guns have differences in tang shapes and sizes between some frame size. But hammerless guns have the same size tangs within most of the common frame sizes.
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B. Dudley
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