Here is a good summary of the recently filed lawsuit, and link from where it came from:
ASA & LEADING 2A ORGANIZATIONS
FILE LAWSUIT TO CHALLENGE NFA
On August 1, 2025, a coalition of four leading gun rights organizations comprised of the American Suppressor Association (ASA), National Rifle Association (NRA), Second Amendment Foundation (SAF), and Firearms Policy Coalition (FPC), announced the filing of a joint federal lawsuit in the District of Missouri challenging the constitutionality of the National Firearms Act (NFA). In 1937, the Supreme Court ruled that the NFA was primarily a revenue-generating measure and the registration requirements of the statute served to verify who had paid the required tax. With the tax rate of $0 as part of the One Big Beautiful Bill, the constitutionality of requiring suppressor owners to register with the federal government is no longer valid. This litigation joins Anderson v. Raoul, and Padua v. Platkin, the ASA Foundation and Silencer Shop—backed lawsuits challenging the constitutionality of the ban on suppressors in Illinois and New Jersey, at the forefront of pro-suppressor litigation.
ASA-F WILL FIGHT UNTIL EVERY SUPPRESSOR BAN IS OVERTURNED!
1. The registration and tax scheme of the NFA is unconstitutional
In 1937, the Supreme Court ruled that the NFA was primarily a revenue-generating measure and the registration requirements of the statute served to verify who had paid the required tax.
2. THE SECOND AMENDMENT PROTECTS YOUR RIGHT TO HAVE SUPPRESSORS
Suppressors have been classified as firearms since 1934. As such, they are bearable arms and must be afforded the same Constitutional protections by the Second Amendment as firearms.
3. ASA-F WILL FIGHT TO END THE REGISTRATION REQUIREMENTS OF THE NFA
Suppressors are modern day hearing protection devices that should not be subject to the unconstitutional tax and registration requirements of the National Firearms Act.
https://suppressor.org/litigation/litigation-missouri/?mc_cid=063858277e&mc_eid=af62a3ce88