Definitely the same concept. Not sure that HCA did the one on eBay but it’s possible.looks like one of these: https://www.hellscanyonarmory.com/o...apped-Factory-Tikka-Takeoff-Barrel-p574286342
I think if I’m spending money on a carbon barrel I’d go with one of the custom blanks instead of a turned down tikka takeoff. But that might just be me