From an AA manual:
The trigger weight of pull adjusting screw is located inside the rear plug retaining pin. The rear sight has to be removed first to access the screw. Adjust using an allen key: clockwise to increase weight of pull, anticlockwise to reduce. Sear engagement is adjusted by the spring loaded screw located just in front of the trigger; cloclwise to reduce engagement, anticlockwise to increase.
There is awarning that excessive adustment in either direction will make the gun inoperative. Avoidsmall sear engagement as the gun may discharge at the slightest touch.
Hope this helps.
Cheers, Phil