Ai Sorachi shows how to install the DCI Guns Air Brake Unit to lessen the sound signature of your AEG. They installed the unit in a CAT electric gun, modifying the gears to a 13-tooth MAP sector gear and swapping the motor for a G&G 18k motor to prevent piston clash. The presenter explains that while the air brake reduces the muzzle report, it also lowers the initial velocity to around 88.8 m/s. They demonstrate the sound difference with and without the air brake and initially conclude that air brake pistons are not recommended due to air loss and potential for piston clash. However, they found that combining the air brake piston with a suppressor resulted in a very quiet setup, changing their recommendation for those seeking maximum sound reduction.