You are not wrong.
However, at this time, these muzzle devices are not suppressors.
They, like all things, could easily be made contraband.
But that is future We’s problem. Buying and enjoying enhanced muzzle and recoil control devices, or not, based on what might happen in the future, or not, is a sorrowful way to live.
Carpe diem.
Here’s an article you may enjoy, Al.
https://www.ballisticmag.com/6-of-the-best-muzzle-blast-control-devices-available/
I agree that they are not quite as effective as a muzzle brake with recoil and rise compensation. Technically all the gas is moving forward from the muzzle, even though it strikes the “end cap”.I agree good article. I have a sound forwarder on my RAR 7.62X39. But i don't think it does much brake wise.
https://www.ebay.com/itm/153453402437