RickB;
I'm sorry that I can't recall off the top of my head which screw does what.
I definitely do recall a very nice B-78 a friend brought over after he’d just bought it. Someone had adjusted its trigger and the hammer would no longer stop slightly above the firing pin when it was manually uncocked it sat on the firing pin. If I recall right, they should have a sort of "half ####" or safety position like the older ‘94’s do when they are working correctly.
Anyway it was an interesting hour as I recall trying to get it all set back to where it functioned safely and had a decent pull.
I’ve played with at least 2 of the B-78’s in the past and I don’t recall either one as being able to get quite as nice of a trigger pull as a No. 1 or an old Hi-Wall, but they were certainly useable once we figured them out.
I will note that both of them had the octagon barrels, one ’06 and the other a .25-06 that shot very well.
Sorry I couldn’t be more help, but they are certainly a nice rifle in my opinion.
Regards,
Dwayne