Ruger MKII Hammer Bushing by Volquartsen This MKII Hammer Bushing is precision manufactured by "Swiss" screw machine equipment. The hammer pivot pin hole has been drilled & reamed for improved precision to help eliminate variances (wobble or play) that can be found in the factory bushing. Black oxide finish and hardened. Replaces factory part #A02505. Please Visit our Volquartsen Home Page!