I just thought of this and was curious. The multiple barrels are to help combat heat accretion, but do they also create a vortex?

The barrels spin so fast and grind against the air around them, cooling them off slightly better than a static barrel would. But do they also create a slight vortex that pulls in the surrounding air which would help cool them off further? And if they do, has there been any attempt to put small fins on the barrels to increase that effect?

And lastly, if this was true, how much would it help?

My SPSh-44, probably my most useless purchase, but hell it is only money.

any know which model?

Colt 635 with a C-More on their gooseneck “scout” mount, and a Wilcox Nightstalker IR grip.
Wilkinson Arms Linda with the AR stock adaptor, C-More red dot, and unknown light and laser on their barrel attachment.