The nature of the "beast" It's referred to as polygonal rifling. As I'm not an expert by and means, I refer to google for an explanation. It is supposed to increase the seal between the round and the barrel.
https://www.google.com/search?q=pol...2.69i57j0l5.6868j0j7&sourceid=chrome&ie=UTF-8
Hope this helps, I had to look it up myself some time back as I was used to the old style sharp edged rifling from the days of my military service and S&W 38s.
https://www.google.com/search?q=pol...2.69i57j0l5.6868j0j7&sourceid=chrome&ie=UTF-8
Hope this helps, I had to look it up myself some time back as I was used to the old style sharp edged rifling from the days of my military service and S&W 38s.