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your tappet and selector are prometheus (if they are stock) and your gears are reinforced g&p. unless they are worn i would just leave them alone. they are pretty tough and will last with only a pdi 170 spring. i would keep the stock spring guide as it's the best i've seen and fits the mechbox perfectly. the piston is a g&p polycarb that looks suspiciously like the ca one. i would change the head set though to a systema silent head set, as the stock one will wear down on the o-ring and fail, but that will be after many thousands of rounds. you must have spent a pile on parts thus far considering the initial cost of the gun too. the stock cylinder is prometheus and the main cause of piston head wear is from the cylinder finish being rough on the inside. a polished cylinder would be better, but with a silent head set and good lubrication you should be good for a long time.
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