Here is a petition to stop the process. Don't know if it will do what it is setting out to do, but sure wouldn't hurt to sign it.
https://petitions.whitehouse.gov/petition/stop-batfe-banning-xm855-ammunition/XrvVh1cj
https://petitions.whitehouse.gov/petition/stop-batfe-banning-xm855-ammunition/XrvVh1cj