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A plastic tube with guide slots on each side, and teeth in the bottom. The piston is actuated by the sector gear, being pulled back along it’s guides to compress the drive spring. At the end of spring compression it is released to be pushed forward as the spring decompresses.
SHS High Strength Polycarbonate Piston w/ Steel Teeth for Airsoft AEG Gearboxes
SHS CNC Machined Lightened Aluminum AEG Piston with Stainless Piston Teeth
10 Metal Teeth Piston Reinforced Polycarbonate/Steel