I'm well aware of sonic cracks. I was mainly referring to the issues with the direct impingement action. If you want a good subsonic round, then I'd certainly recommend the 300 BlackOut. It was developed by an acquaintance of mine at Advanced Armament Corporation.
Any treaty needs to be passed by the senate before it can be signed by the POTUS. They will never get 66 senators to vote for the UN treaty. It would be a death knell for their career.
Where the concern should lie is that the POTUS was caught telling a member of the Brady bunch that he was...