RE: thompson center 56 smooth bore ?????
All my green mountain barrels in my Renegade stocks only need to have the thimble rib cut off a small amount and then turn the ramrod tension spring around. They work great. If that smoothbore is in a Renegade stock it would be 1" on the flats like tcshooter said.
also, tcshooter.. welcome to the forum.
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