The SL8 were brought in during the assault weapons ban and were legal per the ban because they took a 10 rd. mag, barrel wasn't threaded, and didn't have a true pistol grip.If you have a Tommy Built T36, you now own a machine gun. I wonder if the SL8-1 will fall prey to this too since the T36 was identical to it.
https://www.tommybuilttactical.com/t36-upgrade/letter-of-explanation