Yes, I emailed SB tactical and they confirmed that it will work on ANY standard carbine length buffer tube/receiver extension. They also said using your own tube and not theirs did NOT change the ATF ruling about the legality of the brace.
This comes with a standard mil-spec buffer tube, so the positions will be 6.75", 7.5", 8.25", 9", and 9.5"
You would just need a mil-spec buffer tube. This would be a good option: https://www.opticsplanet.com/leapers-utg-buffer-tube-ar-15-mil-spec-6-position.html
No, it will not work on that pistol. That pistol uses a proprietary receiver extension that only works with standard pistol braces. This pistol brace requires a mil-spec receiver extension that is adjustable for length of pull.
The SBA3 comes with a milspec carbine receiver extension. You'll need a castle nut for all installations and a carbine spring and buffer weight for installation on an AR15 lower.
Updated Answer: That is absolutely correct. https://www.sb-tactical.com/resources/batfe-letter-black-aces-tactical/
According to the description it does
Please email us at techsales@opticsplanet.com so we can help find the right parts for you.
Yes, the buffer tube is included.
It is recommended to use a Mil-spec buffer tube or the included tube for best operation.