This POLY idea is very interesting ? Lets see what CGN EXPERTS have to say about it ? 
LOL RJ
A number of advantages are claimed by the supporters of polygonal rifling. These include:
LOL RJA number of advantages are claimed by the supporters of polygonal rifling. These include:
- Not compromising the barrel's thickness in the area of each groove as with traditional rifling, and also less sensitive to stress concentration-induced barrel failure.
- Providing a better gas seal around the projectile as polygonal bores tend to have shallower, smoother edges with a slightly smaller bore area, which translates into more efficient seal of the combustion gases trapped behind the bullet,[4] slightly greater (consistency in) muzzle velocities and slightly increased accuracy.[1]
- Less bullet deformation, resulting in less frictional resistance when the bullet travels through the barrel, which helps to increase muzzle velocity. The lack of sharp surface deformation on the bullet (rifling marks) also reduces drag in flight.
- Reduced buildup of copper or lead within the barrel, as there are no sharp rifling edges to "shred" into the bullet surface and no pronounced corners that can accumulate foulings difficult to clean, which results in easier maintenance. The reduced fouling also theoretically translates to a simpler "copper equilibrium" profile, which is potentially beneficial to accuracy.
- Prolonged barrel life, as the thermomechanical stress upon the riflings are spread over a larger area, hence less wear over time.
