Your gun should have come with a flat choke tube wrench.

After soaking the muzzle end in PB or Kroil as suggested, put the wrench in a bench vise and the holding the barrels in your hands,, try and remove them. You will have much more leverage this way.

After soaking the muzzle end in PB or Kroil as suggested, put the wrench in a bench vise and the holding the barrels in your hands,, try and remove them. You will have much more leverage this way.
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