[mylife]

Funny thing, Poly barrels look worn out when they are brand new.

[davetex]

Here’s some good points....

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,[5] slightly greater (consistency in) muzzle velocities and slightly increased accuracy.[2]

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.

Less sensitive to stress concentration induced barrel failure.

Prolonged barrel life.

[davetex]

Yeah, if you didn’t know it was a poly barrel it looks like it’s “shot out”.