Mike,
It appears your 30" barrels are Vulcan steel and the 26" barrels are Acme steel. I would assume the Acme barrels are original to the gun and the Vulcan barrels were added at a later date. Maybe by Parker or maybe by your father. I wonder if the Acme barrels have been shortened. Can you post clear pics of the top ribs of the barrels at the muzzle.
Patrick
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