Do the Carrier Barrel as 1claysman suggested. Have Briley do the conversion with their Ultimate ultralight tubes. You can have them match the weight of the carrier barrel with tubes to your 12-gauge barrel. This is the absolute best way to go!
In December, I was told by CG that they do not offer Ascent barrels in 20, 28 or .410. I have been considering the Challenger Ascent or a Invictus I Ascent.
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