Ah, that's _irritating_. It doesn't show the flaregun attempting to fire a shotshell, and wants you to subscribe to see any more. I subscribed and couldn't find it after several pages, so a quick search on Youtube got:
https://www.youtube.com/watch?v=9okikBPvmHU
And, as I thought, in the words of the late Dean A. Grennell: "It doesn't work worth sour owl sweat."
While it doesn't appear to be likely to blow your hand completely off, you are definitely not going to enjoy the experience.
Now I just need to unsubscribe from that channel.
Chris.