Simmons Gun Specialties of Kansas City, Mo. did a great job of marketing their vent ribs in the 50`s and 60`s. I would guess some previous owner (Trap shooter) liked the idea of the "new" Simmons Vent Rib and sent the Parker to Simmons & performed the work... Have seen other vintage SBT`s with Simmons vent ribs...
Trap3
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