I tried to lighten up the center part of the picture and I think I see keels but I am not sure. The filing on the rib end looks factory. I have two graded Foxes, both sixteens, and the choke length on them is about 4". I have a Sterlingworth 12 and the chokes on it are about 4" long.
You can ask the seller if he will take another picture of the muzzle - with a darker background.
Best,
Mike
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