Phil from Maine is making a very good point! What I think that he is driving at is in addition to "normal" dirtying up a hunting gun as the result of field use, the action of a gas operated autoloading long gun fouls pretty quickly. The fine powder residue in the gas builds up in the action + the heat of these gases can cause residues to build up resulting in poor cycling amd/or out right jamming and/or a damaged extractor.
To stay in tip-top cycling condition, after firing several rounds (and in my opinion before storage after a hunting season, regardless of how many rounds are fired) the action needs a good cleaning. This requires what might be described as a "semi-break down" of the fire arm so that you can get to the filth.
As for changing out the barrel ... on the Mod. 1100 ... takes ... what ... maybe 30 seconds ?