from the article:
"Its hammer-forged 1:9.84 twist barrel is “conventionally” rifled, but is reportedly a “Polygonal Hybrid.” Its polygonal barrel has a groove in it, which is supposed to result in better accuracy. Perhaps another reason for the change is to give the agents deploying overseas the option to fire lead bullets if that’s the only ammo available. The M model’s muzzle is crowned, again for improved accuracy."
So, seems like they are admitting that a traditionally rifled barrel is more accurate (aside from the lead bullet issue), I wonder why not switch all of their barrels to this design? Why stick with the polygonal rifling at all?
