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Old 11-26-2011, 22:56   #4
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Originally Posted by silentlope View Post
Thanks for the info. Does anyone know what Glock's rationale is for using the different type of rifling? Is there some perceived advantage or is it just a cost of production issue?
to name a few...

Not compromising the barrel's thickness in the area of each groove as with traditional rifling.

Providing a better gas seal around the projectile as polygonal bores tend to have a slightly smaller bore area, which translates into more efficient use of the combustion gases trapped behind the bullet.

slightly greater (consistency in) muzzle velocities and slightly increased accuracy

Less bullet deformation, resulting in reduced drag on the bullet when traveling through the barrel which helps to increase muzzle velocity.

Reduced buildup of copper or lead within the barrel which results in easier maintenance characteristics.

Prolonged barrel life.
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