Hi
First the sear bar and the firing pin have to be "blueprinted".
IF you not have the drawing order them from Rial as it's not possible to archive a good safe triggerpull without knowing the original measurements.
Often some previus owner have grinded down the sear engagement to very small and this can easaly cause full auto and other problems.
When the parts is blueprinted wish not seldom means that the sear hook have to be welded up the engement surfaces have to be policed.
WHen this is all done the hole sear engement can be adjusted on the flat piece of "sheetmetal" on top the trigger. Bending parts of this alternativle as the Swiss did bending the L haped connector (when its unhardend) does all the engement adjustments needed.
Often I adjust the sear bar spring at the end of the adjustments.
This explanation is greatly simplified but I hope you gets my points.
REgards HÃ?Â¥kan
http://www.vapensmedjan.com