On 13th this month like many others I received this notice from my gun club which made me look for more information. I tried to answer to couple of people whose questions appeared lost without answers, based on what I learned from those ATF publications. Here is that notice I got on 13th if it can help anyone else:
On January 13, 2023, the Attorney General signed ATF final rule 2021R-08F, "Factoring Criteria for Firearms with Attached 'Stabilizing Braces,'" amending ATF's regulations to clarify when a rifle is designed, made, and intended to be fired from the shoulder. This rule is effective the date it is published in the Federal Register (likely next week).
Following are the compliance options for an individual (non-licensee) in possession of a firearm equipped with a "stabilizing brace", which is a short-barreled rifle (SBR), after the effective date of the final rule:
• Submit an ATF Form 1/EForm 1 application to register a firearm, within 120-days from the date of publication in the Federal Register, (to qualify for a free tax-stamp - normally $200).
• Permanently remove or alter the "stabilizing brace" so that it cannot be reattached and thereby removing it from regulation as a "firearm" under the National Firearms Act.
• Remove the short barrel and attach a 16-inch or longer rifled barrel to the firearm thus removing it from the provisions of the NFA.
• Turn the firearm into your local ATF office.
• Destroy the firearm. For more information go to Bureau of Alcohol, Tobacco, Firearms and Explosives - How to Properly Destroy Firearms