Some observations based on gunsmithing other people's SBs.... Firing pins break more often than on other semi auto .22s. To disassemble to clean, rear receiver plug must be unscrewed - but it is secured by an internal lockscrew, so barreled action must be removed from the stock, first. The safety is steel, the trigger is aluminum. When the trigger gets worn, the safety becomes unreliable. Trigger mechanism housings may be pot metal or plastic. Mechanism parts pivot in pins which are splined on one end. Once the housing gets worn, the pins can walk. These are economy rifles. They tend to be accurate. They also have some weak spots. I never sold them in my shop. I got to repair the ones that another shop sold. I knew that if I sold them, I would get them back and people would expect me to get them working.
