I don’t care if it is a paintball gun (or Airsoft gun, as seems more likely if it’s not a real firearm), in today’s world you just don’t brandish something like that in public.
Who cares what people brandish in public so long as they aren’t American hating moslems, or other such undesirables.
I just got back from range day. I was cleaning my M variant on the tailgate of my gas guzzling SUV while the Mrs. was in the grocery store. Had two guys come over drooling and a woman that wanted to know if she could buy one like it and where to go to get it. Guess it depends on where you live.