Briley can tube a 20ga down to 28ga. I tried to have it done, but unfortunately the bulge in the barrel could not be reduced, and so they would not tube the barrels.
The remove any dents, and bore roughness so that the tubes don't become "stuck" in the barrels. They also lengthened the chambers to 2 3/4" in the 16ga I had done.
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Keavin Nelson
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