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Hi Peter and welcome. The Heckler & Koch VP9 Match or Slide Kit features a polygonal rifling on its barrel, which is a distinctive feature of HK pistols, meaning it has a smooth, rounded profile instead of traditional lands and grooves rifling; this design is known for its longevity and increased muzzle velocity. Cheers and stay safe!

Hi Peter, yes sir, the barrel features a polygonal bore profile. Stay safe & have a great day!