That's pretty good, but I'm curious why you used the back to front orientation instead of the more obvious opposite? You could've pulled the bullet out and filed a bit flat to use it as the restrictor and it would've been even more stealthy as a bullet whistle, aside from requiring less effort to make since you wouldn't need to drill. Just a thought for next time.
This is a great video and your video shooting and production is on point craft is interesting I just wish you had some kind of audio explaining what it was you were doing and what material or reason for doing things you’re doing
