A safety and bolt assembly system for firearms, particularly for a shotgun. A firing pin is slideable within an opening in the gun's bolt to strike a shell in the gun. The firing pin being movable between a first position in which it is aligned with the opening and capable of sliding movement to strike the shell and a second position in which it is out of alignment with the opening and incapable of sliding movement to strike the shell. The gun safety system includes a spring for urging the firing pin away from the shell and an angled slot for moving and retaining the firing pin away from the shell when the bolt is in the second position. A link is adapted to connect the bolt/slide to a bolt operating system, a pin is secured to one of the bolt/slide or link, and a slot is present in the other of the bolt/slide or link to receive the pin. The slot is angled rearward to prevent movement of the pin from the slot during movement of the bolt/slide in the direction of the link. A leaf spring support member is movable to permit the pin to be removed from the slot while secured to the one of the bolt/slide or link and to permit the bolt/slide to be completely removed from the receiver without removing the operating system from the gun.