Sorry simmo bit of an old joke... I used to say there's no point banning gps watches in wre races because they're no use (in an elite race) - it makes just as much sense to ban Kawasaki Ninjas.
Being serious for a second the iof have finally seen sense and changed that rule - gps watches (and presumably Kawasaki Ninjas) are now allowed :)
As far as I know there's no IOF (or OA) rule against the carriage of firearms. Readers from Orienteering USA may be able to advise whether they're compulsory at events in Alabama (where the World Games are in 2021).