Not concerned about the barrels. I have shot a lot of trap and skeet with this gun as well as Dove.
I usually get RST 2.5s for my parkers, but by all reports from those who have tested it at doubel gun journal 2 3/4 or 2.5 makes no difference.
Plus, I believe Bruce Day, forgive me if I am giving the wrong credit here, said in the past that by the time this gun was made they were designed for 2 3/4 shells to get a better seal.
I am not so much concerned about the shell size as the pressure/velocity.
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"The Parker gun was the first and the greatest ever." Theophilus Nash Buckingham
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