Joe, I have a flintlock era John Manton, later converted to percussion, with the grip safety. I have no way of knowing whether it was installed on the gun when it was made (1809) or when it was later converted to percussion by John Manton & Son. For the reasons mentioned in my earlier post the grip safety would have worked well in a duck blind. I think that my John Manton (8.4 lbs. with strap swivels) likely was used as a duck gun.