Update, and range report on the Lovell Krag.
First the set trigger:


Pushing the front trigger locks the arm down under control of the rear trigger. ( set screw adjusts engagement- adjustable down to where the merest touch releases it) Second pic shows how arm flies up to hit the kicker which trips the sear. Were these made/sold by Pacific?
Me firing the rifle, and the result:




(That's four shots, .350", 100yds, 16.5gr. H-322/50gr. Sierra Blitz. I didn't have the courage to fire the fifth shot!! The rest of the groups averaged between 1/2-3/4" for five shots at 100 yds., plus one ten shot group that went into slightly under an inch. She shoots!)