Originally Posted by
watercooled
Yeah, as I said it's usually the case that the firing ping is blocked/locked, but if the hammer is manually lowered, the safety may not be present (as the trigger will have been pressed) and the hammer will be resting against the firing pin, in turn resting against the primer - a sharp strike against the hammer may fire the gun.
Anyone correctly trained in using the gun shouldn't have this problem though, as the decocking lever should leave the firing pin safety engaged.