Volatile is supposed to stun barrier champions - and it does using volatile flow or the fragment that gives volatile rounds on grenade kills - but it doesn’t work when volatile rounds are granted from gyrfalcon’s exotic perk (emerging from invisibility). Im aware your gun can’t already be used to stun another type of champion (my funnelweb with overload smg won’t ever pierce barriers) so I was using commemoration. I was able to stun barriers with volatile flow but the icon never appeared by my gun when coming out of invis, despite my gun having volatile rounds.