Piston short stroking is a well-known technique that helps increase ROF. The logic is simple: decrease piston cycling time by removing teeth from the piston and the sector gear. Advantage? Less stress on the gears, the motor, and the battery. Gain? One sixteenth rps per every tooth removed. Loss? 15-20fps per tooth removed.

Short stroking is done by removing teeth from the piston and the matching teeth from the sector gear.

First, the piston.