MagPul PTS MASADA ACR in Rifles (AEG) Posted May 4, 2011 · Report reply I just put a Systema M120 spring in mine and the motor was having issues pulling it. Thinking up upgrading the motor. Anyone see the new G and P Satan or the SHS ones? No need for a torque motor to pull that spring. An SHS high speed motor will easily pull it, and much faster.