Ed, I have a Investarms 36 caliber don't know what model I own a 50 cal percussion and found a barrel on flea bay a few years ago that would fit my gun. With the set trigger and 25 to 30 grs of 3 f will make cloverleafs at 50 yards all day long. I did ad a Skinner Peep sight in place of factory V.. Also I don't have to swab it till about 8 or 10 shots when hunting.