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For: Echo 1 MAX Series Light Weight Piston w/ Metal Teeth (V2)Product Information:
Awesome piston, have always been a sucker for full metal tooth racks opposed to poly-carb setups because of the enhanced reliability. I can say with confidence that when my gun is pulling 27 RPS on an M120 spring, 10 second bursts are not a problem. Combine this with some high caps, a Matrix Turbo 3000 motor,a 9.6v battery, and you've got yourself one hell of a monster.
14 tooth, good for AOE
Replaceable tooth racks
Light, but strong
Good for high speed or torque setups
Cheap when compared to similar Matrix pistons
No cons that I can find so far, it's lasted well over 3000 rounds so far. Just be sure to grease the teeth generously to prevent unwanted wear and tear upon sector gear teeth.