Md,
I had an 1885, worst trigger system I have ever seen on a Browning product!
It was a few of years ago and at that time there were not after market triggers availible.
The triggers for the 78 will not fit. I don't believe any of th parts are interchangable.
As I understand it, the 1885 has some kind of system that prevents the gun from firing if the hammer falls to slow or fast. How they do that, I have no idea
I just know mine would only fire2-3 times out of 5.
I had mine to 4 different smiths trying to dial the trigger in.
The rifle I had was going to be converted to a 35 Whelen. But after fighting with this trigger, decided it would be better to get rid of it and build a Number 1.
I invisioned standing on a ridge in Montana, seeing that Bull of a lifetiem walk out in front of me. Throwing a rifle to my shoulder that I had just spent a ton of money on for a new barrel and wood, only to hear it go click. My next move would be to wrap it around the nearest tree. So I decided to cut my losses, I am 1000 times happier with the decision.
JMHO