I've got a 10/22 that's got nearly 10k rounds through it. The last time it was cleaned... nearly 10k rounds ago.
So far it keeps on functioning just fine. That said I DO do a field strip and wipe the interior parts down with a cloth soaked with Militec-1 oil every couple thousand rounds (basically when I remember to do it). Not exactly a cleaning, more like just making sure everything is coated in oil so as not to rust.
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