…from and after the passing of this act, all musket barrels and pistol barrels, manufactured within this Commonwealth, shall, before the same shall be sold, and before the same shall be stocked, be proved by the person appointed according to the provisions of an act . . . with a charge of powder equal in weight to the ball which fits the bore of the barrel to be proved . . . § 2. That if any person of persons, from and after the passing of this act, shall manufacture, within this Commonwealth, any musket or pistol, or shall sell and deliver, or shall knowingly purchase any musket or pistol, without having the barrels first proved according to the provisions of the first section of this act, marked and stamped according the provisions of the first section of the act to which this is an addition . . .