On all models, once the striker (early models) is cocked, if you pull the trigger while the action is open, the striker/pin will protrude from the face of the action and when you shut the barrel, it will sear off the tip. Starting with the "B" models, there is a hammer, and if installed correctly, is rebounding, and you won't have this problem. Also, as mentioned earlier, dry firing will cause the pin to break. As mentioned earlier, the other weak point on these guns is that the stocks crack where the stock meets the action. It is very common to find stocks cracked at that point, even on the .22 Hornet, which should have no recoil to speak of. In my book, I go in to details on this.