From Tru-Fire's website:
Underneath the trigger in the slot of the body you will see a nickel plated round part. While looking at this part, turn the head of the release. What you are trying to see on the part is a set screw. This set screw is 1/16th in size. Once you locate the set screw on the nickel plated part, go ahead and un-loosen the set screw by turning it counter clockwise only 1/4 turn of the allen wrench. This is important: make sure you leave the allen wrench in the set screw -- if you want more travel (not as sensitive), turn the head of the release counter clockwise (have the head pointed at you). Try only turning the head of the release 1/4 turn at a time (remember, the allen wrench still must be in the set screw). After you have turned the head the 1/4 turn, then tighten the set screw back up on the silver part. If you want the trigger to have less travel, you would have turned the head clockwise.
Trigger tension adjustment:
Take your release in your hand with the head pointed away from you. Turn the tension dial to the right or clockwise to decrease trigger tension. Turn the tension dial to the left or counter clockwise to increase the trigger tension. THIS DIAL DOES NOT ADJUST TRIGGER TRAVEL BUT TRIGGER PRESSURE ONLY.
HURRICANE, TEAM REALTREE, MOSSY OAK
Locate the set screw on the trigger. Using a 1/16th allen wrench, turning the set screw out or counter clockwise will decrease trigger travel. Turning the set screw into the trigger or clockwise will increase trigger travel.