Meshmixer supports are included on one STL. An unsupported version is included.
It is very tight to get into the frame. I use a needle file to trim the corners and edges just enough to snap the trigger inside the trigger guard.
It doesn't suffer much stress, except for the safety engagement, when you crush on the trigger. PETG seems to sag too much. I use PLA + CF for stiffness, which seems to work best with the safety. Other than that, the trigger works well.
The author marked this model as their own original creation.