If you are a user of ESS-2000 or ESS-2000AX, check to see “GUN TRIGGER” has been selected on “Trigger Setting menu” on UTILITY screen or the top menu. If other than “GUN” has been selected, the gun trigger is inoperative. 

If you are a user of ESS-2002 or ESS-2002EX, check to see that the GUN has been selected on the Trigger Selection key (GUN/CONTROLLER)  on the controller (simulator main unit)