Hi 'Nando,
If the barrel is older than the rest of the gun the barrel tang must have been replaced as it is of characteristic 18th c. form, with the screw entering from the top.
I would also say that the buttplate shows the same rural rustic style as the barrel.
Conically widenened touch holes are known from Prussian flintlock muskets of the 1730's-80's; their purpose was to not have to apply priming powder to the pan: with the barrel loaded, and the frizzen closed, the musket was just put down on the ground a few times with the buttplate which caused a sufficient amount of powder to exit the touch hole and fill the pan.
Best,
Michl
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