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Don't reuse marginal parts. If they're worn...toss them.
Take a good look at your gears as well, especially the sector gear teeth that engage the piston. If they're worn, replace the entire gear set (or else the worn gears will just prematurely wear out the new piston).
If you've got the stock spring in there, consider dropping down to a Modify S100 or S110. The "weaker" springs will put less strain on your motor/gear-train and your internals will last a lot longer.
Or...keep it souped up and just resign yourself to replacing parts frequently.
Take care when swapping pistons/piston-heads...ensure that the combo that you end up with is long enough so that its teeth index properly with the sector gear (or else you'll just strip the new piston). For example, a deepfire piston and System silent head set that I had in one rifle was about 1-1.5mm too short. Once I used a washer to extend it, it worked just perfectly. The piston is all worn out now...but that's after about 8-9 bags of bbs (and at one point it was setup to shoot 1300+rpm).
Best of luck.
Tys
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