PROOF RESEARCH pre-fit carbon fiber barrels for the Defiance Ruckus offer a simple installation process that requires minimal specialized tools. These barrels come pre-chambered and threaded, making the installation hassle-free. Just torque the barrel into place, verify headspace with the proper Gauges and you're ready to hit the range. Experience unmatched accuracy and performance with the Defiance Ruckus carbon fiber pre-fit barrels - it's as easy as it gets!. Up to 64% lighter compared to traditional steel barrels with a similar contour Enhanced thermal resistance - optimized heat dissipation for cooler and more durable barrels The product exhibits exceptional durability, being encased in high-strength, aerospace-grade carbon fiber that is infused with a proprietary matrix resin Barrel twist rate - 1:8