It looks like your gun has been re-case colored by the look of the forend iron.
Most of the markings on the barrel are factory. Some are not. Namely the Full and MOD choke markings and the "made in USA". These are not factory markings. There looks to be maybe remington repair codes stamped on the flats as well.
Another curiosity is the blank circle. This is usually stamped with the barrel steel type inside of it.
My guess is that these were original barrels that were fitted to the gun later on by some other source. Maybe Remington. Maybe not.
Is the rib matted? Roll stamped?
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B. Dudley
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