I searched and I can’t seem to find an answer. Is there a definitive answer to the markings on lower part. I am wondering because I have “C” marked hammer, and an “M” marked trigger and was wondering manufacture. They didn’t come in a kit, bought them individually.
Sorry I can’t help on those markings but I can tell you they are no RRA.
RRA notched hammer = “4” and on opposite side has 2 separate “S”
RRA trigger = “S” on one side