6878mm, not quite comparing apples with apples, when rough shooting in England it is fairly flat so gun in hand, dog ahead, no tough terrain, when driven shooting you have your loader, hell you dont even carry the cartridge bag so no need for a sling but you say no slings on English doubles ?? youll see them on 99% of double rifles ! different terrain etc, a lot of Spaniards have them on doubles over here, best