My brother has this rifle.
He had a Timney trigger put in it 30+ years ago.
This year it started misfiring, every 20 or so rounds he gets a light primer strike.
I took the rifle apart to inspect the trigger. If I am careful, I can actually pull the trigger and disconnect the sear without firing the rifle.
Then I noticed: There is no Sear pivot pin in the rifle.
Seems to me this is the obvious issue.
But since it worked for 25+ years, IS there a reason the timney trigger would not use a pivot pin? I can't imagine but stranger things have happened.