I have a pristine early model SX-1. I'm sure it has the original first generation trigger assembly. This trigger has an allen screw trigger adjustment. I also believe it has the older dual spring set up. Anyway, I have tried to adjust the trigger for some pre-travel but not a lot. The problem is the adjustment wont stay at such. The trigger migrates back to the no pre-travel position to the very rear of the trigger guard. It works but I would like more feel in the trigger pull. Any thoughts?