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have a jg m4-s, had no problems wit it, but made problems for it lol, as i am a person who cant stick wit things being stock, i added metal bushings and downgraded the spring for a more consisten fps, the jg gearbox ended up needed special thinner bearings, so i upgraded to kingarms reinforced gearbox with king arms bushings, next on the list is a barrel for more accurate shots.
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