The break force of X5 L1 triggers can be adjusted. How is that achieved? A spring provides some of the pull force?

I don't know. I have detail stripped many of my SIGs, but never the X-Five Level 1. The trigger is more complicated than the standard P-series SIG.

Thanks for the photo. I don't see a spring in there, so maybe a geometry change?

Not 100% sure but I believe the trigger pressure screw presses against another part which pushes into the trigger pressure spring. The spring is listed as 22 on the new x5 series part diagram.

Look at this picture in this armlist ad. The front tube is the trigger pressure adjustment screw. The 3 separate parts below the trigger unit include the pressure spring and go right where that front hole is in the trigger unit.

http://www.armslist.com/posts/...t-trigger-super-rare

Thanks Yuns, I appreciate it.