...here ya go, Pardner: Posted by Doc McGee, SASS #51213
Old Boz,
I'd check and/or replace the firing pins, the originals can be too soft and mushroom which would make them tighten up. I'd also check how the pins, springs, and such are assembled. If they are not assembled exactly right, there can be problems, too. Check your schematic to make sure you've got them together right.
Do the firing pin return springs seem to be stiff enough to return the pins?
Anyway, I replaced my firing pins with the black anodized stainless firing pins from Longhunter. Viola, no more problems! DTrader and Brownell's also have wrenches for removing the firing pin bushings. I created mine out of some steel scrap and three drill bits that fit the holes in the bushing.
Another thought, do you shoot the Holy Black? Might be crud buildup if you do. Clean well and after every shoot.
sheepdog says:...and the site, which has a lot of maint. tips:
http://marauder.homestead.com/files/Stoeger2.html