Mine are full-length removable with choke tubes. Only shoot the gun maybe 8-10 times a year, rarely for over 100-rnd. sessions. I make sure there is a good coating of lubricant (not dripping!) in the bores, and pay special attention to the screw choke lubricant so nothing gets "welded in place" from neglect. I rarely remove the tubes (maybe once a year, weather dependent mostly) to check on the above, then replace and store them right in the gun. My original Damascus barrels were deemed "unsafe with any load" after micing and gauged for BWT, so I ordered out the Briley full-length inserts. None better!
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