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A fluted barrel offers more surface area that is supposed to cool faster
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It cools faster because there is less metal. It also heats up faster. I am sure the increased surface area increases the cooling, but you have to wonder how much more surface area you are really adding. I believe it is minimal. I flute 2 or 3 barrels a week.
Quote:
A fluted barrel has more rigidity than a standard barrel,
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Barrel rigidity is a function of cross-section diameter. A fluted barrel is more rigid than a non-fluted barrel of
equal weight, because it has a greater diameter.
The primary reason for fluting a barrel
used to be weight reduction, but it seems as if it is now used as a decoration (examples are diamond fluting, helical fluting, interrupted fluting, etc, found on a variety of firearms).