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Thanks guys! I figured they were mm measurements. I'm still confused on how to determine the choke with the numbers though. Is the 18.2 indicating the bore diameter and the other number the choke measurement? If so, the bore is .7165" rather than .729". If 18.2 is not the bore, then what is it? Which number is referencing the choke when each barrel has 2 numbers stamped on it?
Threaded Mode