Oiling it is part of occasional maintainance, it's needed to keep the breech lips lubricated so the BB can pass easily, otherwise it'll jam. I can't count how many guns I've dealt with on the field that were jammed, pop the BB out and the next would jam, drop of oil in the loading nozzle, cycle a few times, then all BBs would feed perfectly the rest of the day. Really, all you need is a wipe on the breech lips, but it's impossible to do when the gun is assembled, so a drop down is what we do.
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