Tommy of Airsoft GI shows his custom built Classic Army M16A1 AEG. For this build, he used the SHS 12:1 which is a short stroked two teeth gear set, the GATE Titan ETU MOSFET, Classic Army TORQUE Motor, SHS M130 Spring, the Action Army 6.01 M16A1 length Barrel, and it is S Hopped. This AEG averages 416-421 FPS.