OK, so the only real advantages I can see are weight reduction (about a pound for a 24" heavy barrel), and it being more rigid than a barrel of equivalent weight with a smaller outer diameter...

Potential messing with sympathetic vibrations though...

Sooo...back to where I started smirk

JYD #126
Super JYD #13

"Those who would give up essential liberty to purchase a little temporary safety, deserve neither liberty nor safety."

- Benjamin Franklin

"A free people ought to be armed."

- George Washington