The day way spent designing a basic linkage in order for a servo to pull the trigger of the gun. The design is shown around the gun below.
A number of lego beams wrap around the gun, terminating in a pair of gears. The linkage is connected to the gears slightly off the central axle. Thus, when the gears are rotated rearwards while the gun is fixed in place, the linkage is displaced backwards, depressing the trigger and firing the gun.
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