You definitely have to remove the breech plug if you are going to put in a liner. You need to make sure the liner doesn't extend into the barrel. I second the use of the Rice's breech plug tool and vice jaws - they are great. Another alternative would be to grind the jaws of an adjustable wrench to an angle to match the plug.
Right on martin9!!This guy in inletting a barrel. He's gonna want to remove the plug. They're no big deal. A lot of barrels come with the plug not fitted so you have to take it on and off a dozen times or so to fit it...again, no big deal.
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