Joel,
I do not recall registering on this board, and I don't normally report here. So, if the Moderator (or registered users) takes issue with my statements, please disregard and/or delete my message.
See if you can link to any original M-1877 small frame Colt, or to the M-1878 large frame Colt type revolvers,
This should give you some idea as to the trigger relationship within the trigger guard between SA & DA type revolvers.
Do your own research and see what you come up with?
My best,
Blair