Carbon Six Rifle Barrels offers a whole host of benefits over traditional metal barrels. First, it is important to understand what a carbon fiber rifle barrel is and is not. At its core, a Carbon Six barrel is a stainless steel, precision barrel. The barrel is not made of only carbon fiber, but instead utilizes a proprietary contoured McGowen blank that is profiled to our exacting specifications. We then use a series of manufacturing processes to apply a carbon fiber outer wrapping. There is a lot of fluff and misconceptions out in the marketplace about what the true benefits are. We avoid making outlandish claims, but what we do make is highly accurate, precision barrels with a 1/2 MOA Guarantee that we stand behind. All of the barrels made at Carbon Six are made-to-order and hand crafted in the USA. We offer your choice of length, twist rate, chambering, threading and more. You get the barrel you want delivered to you in a reasonably fast time. AVAILABLE CONTOURS Carbon Six offers four standard contours. Our contours are all target style, straight contours. Three measurements dictate the contour of your barrel. 1- Your barrel length. 2- Your shank diameter. This is dictated by your receiver. 3- Your desired muzzle diameter. The beauty of a CarbonSix barrel is the amazing weight reduction. Many customers choose to take full advantage of this by selecting the light option. If you want a medium or heavy, you still get the benefit of significant weight reduction. As a percent of weight reduction, you gain as the contour goes up. A CarbonSix bull contour vs a full stainless bull contour will yield the largest reduction. FEATHERWEIGHT Our lightest option. This featherweight barrel has a maximum length of 24″. The outside diameter is a fast & nimble .750″ at the muzzle. SENDERO One of the most popular contours on the market. This barrel will feature an outside diameter (OD) at the muzzle of only .830″ MAGNUM Need something heavier? This barrel will feature an outside diameter (OD) at the muzzle of .900″ BULL Our most stout option is the heavy contour. This barrel will feature an outside diameter (OD) at the muzzle of 1″. This is also very similar to a McGowen #8 contour.