the new fluted barrel looks pretty cool. it'll probably show up in movie being shot by a dude having a name like "diesel" or "hammer".
i thought the idea of fluting was to make a barrel stiffer, or mechanically better than a regular barrel, not just lighter. also, fluting would shift the mechanical resonance to some less detrimental level. the basis, i think, is to take the same weight barrel and shape it to produce a more stable barrel. simply removing mass from a barrel doesn't seem that it would make it a better shooting barrel. i would guess that the fluted barrel would have a larger diameter and the same weight as the original barrel to make a difference.
i don't know ......
sg