I was taking out pistons with my M4 with a M120 spring. I bought a deepfire titanium piston and all the problems have went away. The piston is made out of a fiber so the gearbox does not take the pounding you’d get if you used an aluminum (and no loss in rpm) but the gears are all metal so you get 0 wear. They are more money but are worth it in the end. A guy in our club has been using his in a heavily upgraded gun for a long time and it still looks like new.
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