very Custom Products Barrel goes through a 9 step process on some of the most technologically advanced and precise machinery on the planet. After machining and diamond honing, each barrel is hand inspected and hand polished for a finish that is near perfection. A smoother inner bore means less friction on the ball, which translates to fewer barrel breaks and greater gas efficiency. CP's Classic two-piece barrel system allows you to build a kit tailored to your needs, with only the bore sizes and tip lengths you want. In addition, two-piece barrels are available in more bore sizes than the one-piece Classic, and two pieces allows you the flexibility to mix and match colors to show off your personal style!