A "tapered rib" on a Parker usually describes a rib that is rather severely tapered, like from 7/16" at the breech to less than 1/4" at the muzzle, a 3/16" taper over the length of the barrel. The normal taper of a Parker rib is more like 1/2" at the breech to 7/16" at the muzzle, a taper of only 1/16" over the length of the barrel.
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