Insert Trigger into the center hole of Handgrip Housing.
Put the notch of Trigger catch into the tenon joint on Handgrip Housing.
Use fingers to press the locks on two sides of the Trigger lightly.
Then put the lock into the hole each side on Handgrip Housing.
Free fingers and allow the lock on Trigger to insert the hole on Handgrip Housing.
Trigger will not fasten after assembly completed.
