Sorry about the poor diagrams but I was using paint! If you can suggest any better program for showing diagrams like this, please let me know (I would really appreciate it)!
Youtube video link: Here
This is the improved version the 'P105 San'
2. Side panel
3. Trigger system
4. Back panel
Circle: Bolt for the trigger mechanism to rotate on.
Green: Elastic bands to spring trigger and hold ammo in place.