I have read most of the threads regarding cleaning the fx m3 barrel. However, I have yet to see anyone address what I feel is pretty important. Which direction is best? I tried my home made patch worm and fed from the breech end. As I inserted, I kept having a feeling that I might be poking some internal o-ring and doing damage. Then I thought I would push a cleaning pellet from the end of the barrel toward the breech. That had me thinking if there were any o-rings then I might be pushing them out. Does anyone have a definitive answer?