Thanks Harry and Dan, I know I need to measure more than just the muzzle. I will try some of your ideas to measure 5-6" down the barrel. It seems like it is more opened choked than full when I was shooting it yesterday.
From the research letters on my Parkers I have 12 gauges patterned from 120 alt the way to 190 pellets at 45 yards. That's why I had assumed this was Improved Cylinder or Light Modified, because 140 pellets @ 45 yards was in the letter. The Lifter I have that letters at 120 pellets @ 45 yards shoots like its choked Cylinder/Cylinder. I need to take some better measurements.
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Threaded Mode