The barrels are not swaged, they are machined that way to give more thickness for the choke tubes & keep down barrel weight. Where thin choke tubes are the only way to install choke tubes in normal choked barrels. The factory choke tube barrels are more robust & safer (dings & barrel damage from dropping) than thin choke tubes. Some choke tube barrels are machined with a straight taper & some with a slight bell. I've had both Thin & factory. Personally, I'd rather have the more robust factory choke tube barrel.
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