To the best of my knowledge, those cuemakers build CF shafts from tubes acquired from other sources... probably higher quality than many other CF shafts, but still outsourced.There are.
Shelby William start making them.
Astle also making them.
Barnhart is also doing it.
Ariel also starting it also.
Some other in cue maker group on Facebook also making them. They slightly more expensive than bull or rhino but they play well.
I have a Barnhart CF shaft... amazing quality, but he did not build the carbon fiber tube... Again, I was just wondering if there are "Made in the USA" CF tubes made anywhere... certainly, there are different levels of quality available..