Just for fun I looked at this Parker you mentioned- a high raised vent rib on a bird gun in side-by-side configuration- looks like a debutante coming out party in the Hamptons where the "deb" is wearing a new bowling shirt--The only side by I've see, so far, in my gun show travels that wore a ventilated rib was a Model 21 Trap model with 32" tubes-don't know enough about them to tell if it was factory original or a after-thought, sure have seen my share of 30" Full field grade M12's with Simmons ribs and replacement wood and touted as "genuine M12 Trap Grade guns" so our Buyer Beware applies to all spectrums of the world of shotgunnery I should guess! RWTF
