When Parker began offering the trap forend, what is now commonly called the beavertail forend, they found that forend attachment lugs extending from the barrel tended to break their brazed connections to the barrel lower rib because of the greater weight of the forend and the tendency of shooters to exert a tighter grip on the bigger forend. So, they developed a one piece lug, photo following, for use with beavertail forends, either original or later factory additions. This cures the brazing fracture problems.
Beavertail forends became popular in the 60's and some Parkers were converted to the larger, heavier forend. Generally, these were made without the long screw that Parker used that extended from the end of the forend and into the front of the forend iron in a special screw receptacle. Without that screw, the forend wood tends to loosen from the iron. The one piece barrel lug and long screw are tell tales for factory work, or at least factory parts.
That is my understanding based upon my reading and direct experience looking at guns, including seeing fractured forend lugs. Others may differ. Others may have personal experience with trap forends installed without the one piece lug; I don't.
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