Remove four (4) phillips head screws from the interior trigger guards. Pull the trigger guards straight out to access the interior triggers.

The screws are interchangeable, but the guards are not.

Push up on the trigger base and pull it up and out of the slot it's sitting in. Pull the trigger assembly down and out of the case back. Left side shown, right side similar.

The trigger is pushed up by a spring which will send your pieces flying if not restrained.

Separate the trigger base from the trigger itself by popping the retention bar out of the bottom of the trigger (purple circle)

A flathead screwdriver may be used to gently pry the bar down. Do not bend the bar or break the plastic.