I bought my one Mod 12 used. It has the acutrigger, my first one was non- acutrigger. The previous owner of the acutriggered rifle had put a set screw in above the adjusting spring. I thought that was the way it came from the factory until I found out later. I did not remove it because it looks like a good idea to prevent the spring from adjusting itself during repeated use. Probably would never happen but better safe than sorry. Quick