Radial flutes would cool better due to improved convection but wouldn’t maintain stiffness like axial flutes.
I’m guessing that’s why it’s not a problem, and maybe even a benefit on something like a Tommy gun. Depending on the purpose of the carbine in the link, that may or may not be an issue.
Not as stiff I suppose, but depending one what you compare it to, not sure it matters. If you think of it as a heavy barrel with a bunch of grooves, it’s somewhat less stiff. If you think of it as a pencil barrel with a bunch of reinforcing bands, dang, it seems pretty strong! Bet it cools better.
And I have to give them credit for not doing things the way everybody else does-- bit of a bold stroke I’d say.
Plus, I’m not gonna deny it… looks Thompsonish=looks cool.
Theres a pic of an AR with wood furniture floating around here somewhere, they could slap that barrel on it, and get a Thompson/Stoner lovechild.
I dont dis-like the look though, its just a little differant.