I don't believe that screw will allow the safety to be operated manually at all, I believe it locks the safety in the off position (as Glenn noted) so that the gun is ready to fire at all times; at least that is how it works on my G Grade. In my opinion, having that screw convert the safety to operate manually would be far more preferable than the way in which it is designed; I suppose Uncle Dan was thinking this would be a great device for trap shooters, but I never seem to have a screw driver when I want to make that adjustment?
