prop gun open bolt design

my design of an very simple open bolt gun for props.
needs rubber bands to go around the trigger and sear pins and for the bolt.
the left side fits into the right side via pins and the corresponding pin holes. the grip of your hand will be enough to hold it together while you grip the gun because of the pins in the sides.
i included stp file in case you want to take it apart to look at it.

* i included the stl files.