I hae this gun at home

It was built in 1846, It belonged to my grandfather, its 45 cal, 44" barrel 1.25" across the flats. It has a double set trigger,if you adjust it and give the sear all the engagement it can possibly have it breaks at 4oz. pull.
In todas world if there were 7.8 million of these out there, how many folks would have them "misfire" as you call it, so is it something wrong with the trigger, or something wrong with people deaming the trigger unsafe?
any mechanical device is prone to being out of adjustment, broken, or worn, being able to determine something is amiss and what we do about it determines how unsafe it is.
do you fix it or take it to someone qualified? or do you put it back in the safe and never use it, or just sell it to the unsuspecting public?
RR