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Originally Posted by Richard Flanders
Sounds like fun hunting! All my friends go to Africa to hunt the big fur; I just want to go hunt birds! Keep asking questions and folks here will get you going somehow. A good welder could easily extend your firing pins a bit if that's the issue. Another possibility is that the sears have been shortened a few times over the decades and the hammers now do not cock enough to get enough pressure on the firing pins when they fire. Sears can be welded up and re contoured also. Post a few pics of your birds there if you can.
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TIG (tungsten inert gas) aka- Heli-Arc is my process of choice and experience, however-- sears, leaf springs and to some extent hardened hammers with integral machined firing pin tips- TIG may NOT be the best choice- hardened alloy steels require annealing first, then proper interpass temperature must be maintained (TempilSticks work well) then post weld pack in charcoal and asbestos blanket wraps- then re-hardened and possibly drawn-- Properly done it will repair/restore parts- improperly done and if the sears or sear notches in the hammers are distorted by HAZ (heat affected zone) welding input- you may have a potential failure waiting to happen after re-assembly--
Plasma or spray welding build up is a better way to proceeds IMO- no heat input as with TIG----I have TIG welded new sections to top and bottom tangs and trigger guards and trigger plates where needed=- in most "double fitted" shotguns like Parkers- you are working with mild steel (AISI 1018) in the lower 40 C scale Rockwell hardness range-but hardened alloyed and machined to dimension gun parts- sears, hammers, etc- 'whole 'nother ball game' lads, at least in my experience--
