I've made a bind for the Gun arm switch
{down = 3463, up = 3463, cockpit_device_id = 6, value_down = 1, name = _('Gun Arm/Safe Switch ON'), category = _('Weapons Management')},
{down = 3463, up = 3463, cockpit_device_id = 6, value_down = 0, name = _('Gun Arm/Safe Switch OFF'), category = _('Weapons Management')},
In case someone wants it feel free