If you do plan on purchasing the KR-9 SBR, you as a the user must do the following:

– Fill out an ATF Form 1 to make and register a firearm. — https://www.atf.gov/file/11281/download

Under the NFA there are licensed manufacturers and “makers” of firearms. An individual is a Maker. The Maker that files a Form 1 to make an NFA firearm has the same marking requirements as a manufacturer. Those marking requirements are as follows:

Title 27 CFR § 479.102

Serial Number Must be located on frame or receiver / Cannot duplicate Name of Manufacturer City and State of Manufacturer (or recognized abbreviation) (may be on the slide receiver or barrel). Model Caliber or Gauge Name of Importer, City, and State Country of Origin

Most SBRs or SBSs are made from standard rifles and shotguns. You as a maker can accept all of the pertinent information such as model and serial number from the original manufacturer. However, as the maker, same as a manufacturer, you must mark your name or the name of the trust that is making the NFA firearm. Finally, the and city and state listed on your Form 1 must also be marked on the firearm.

Once you get your tax stamp for now KR-9 SBR, you are then legally allowed to use it with the stock attached. Please be sure to comply with all local, state, and federal laws.