The firing pin is not hitting the primer hard enough to reliably set it off every time. I have removed the firing pin and cleaned and lubed it. I see on some schematics that there is supposed to be a spring to return the firing pin. On other schematics it doesn't show a spring. Their was not a spring on it when I disassembled it and the gun functions properly as far as opening and closing. The length from the shoulder of the pin to the tip is .200. Is the pin as long as it should be?