Actual safety feature that directs sound and concussion away from the shooter and bystanders, while not acting to the extent in concealing the discharge that led to suppressors' regulation in 1934.
People who yell about suppressors being restricted lose their point with something like this. Probably why they never talk about them. Please, folks, don't do like folks did with "pistol braces" and make them into attempted workarounds of gun laws. We saw what happened there.