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SIG Sauer refers to their safety systems as a Four Point System. The four types of safety are: the de-cocker, which allows the shooter to lower the hammer safely, while there is a round in the chamber. When the de-cocking occurs, the hammer is lowered but it still stays away from the firing pin. the safety notch, prevents the hammer from striking the firing pin accidentally. the firing pin has its own safety, which makes sure that the pin will not move forward.