I have have never fully taken down any of my guns unless there was an issue with one of them. That said, It is always a good idea to at least take the barrel off and swab it , spray out the chamber with a good cleaner, and oil on a regular basis. This will at least limit the about of debris that may gulf up in the gun and protect it from rust. A full break down is unecessary. If it works fine leave it be.
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