The trigger's tip is currently worn and the hammer can go off with a touch of a trigger even with safety engaged.
From the look at the trigger group there seem to be several possible ways to repair the trigger:
1. Anneal the tip, then micro-TIG weld up with piano string, quench and grind to the spec.
2. Anneal the tip, then slightly bend it up, quench and grind to the spec.
3. Anneal the tip, then slightly bend down, braze on some metal (a metal saw blade comes to mind), quench then grind to the spec.
Considreing that I also have to repair the firing pin retractor broken in the middle and the receiver has to be welded up where the bolt lug approaches ejection window, the 1st method sounds like the best option.
The firing pin extractor can be brazed back together without any problems, but I can also make a new one out of a lathe parting tool. So the trigger is the main issue.
I don't know how to weld, but can braze. My son just graduated from the welders college where he did 80 hours of TIG, he would have to save some ca$h for his own TIG machine with a pencil torch and wires before he could help me. He says with a good small torch he could weld up all 3 items.
What do you think?