Many modern handguns do not have a manually activated safety. The Sig M17/M18 does, but the safety only blocks the trigger from moving rearward far enough to fire.
It may not block the trigger from moving enough to disengage an internal, automatic safety that prevents the firing pin from traveling all the way forward if it is released due to a malfunction. It is also possible that the firing pin block safety does not always work even if the trigger is fully forward.
It may not block the trigger from moving enough to disengage an internal, automatic safety that prevents the firing pin from traveling all the way forward if it is released due to a malfunction. It is also possible that the firing pin block safety does not always work even if the trigger is fully forward.