Main spring for the GBLS DAS, change this part to adjust your muzzle energy.

Approximate muzzle velocity with 0.2g BB
M90: 280-300 fps
M100: 330-350 fps
M110: 340-360 fps
M120: 380-400 fps

NOTE: actual muzzle energy will vary from gun to gun as well as with the barrel length.

To lock out automatic mode an M2 x 5mm slotted head grub screw can be installed in the gearbox case to the rear of the selector plate. As it is a through hole, it should be thread locked into position with the slot oriented horizontally.