You must at least post pictures of the flats of the barrels and the breech section of the barrels all the way around. The flats of the barrels will give us lots of information about the origin of the barrels. More pictures would be helpful also. Mark is correct about the trigger, it is not an inertia trigger if it is a Miller. How did you identify it as a Miller? A non selective Miller trigger is a scarce trigger, not often encountered.
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