The Proof Research Bolt Action Barrel Pre-Fit 6mm Creedmoor 18" with a 1:7.50" twist (5 Groove) and 5/8"-24 tpi threaded profile delivers precision machining and ease of installation, featuring a carbon fiber finish and a drop-in design tailored for the Sig Cross platform to help you maximize performance without extensive gunsmithing. Engineered for bolt-action reliability, this 18" pre-fit barrel combines a tight 1:7.50" twist with five-groove bore geometry to stabilize high-velocity 6mm Creedmoor ammunition, promoting consistent chamber-to-exit hits on target while reducing muzzle rise and felt recoil. The carbon fiber finish not only provides a lightweight, rugged profile but also enhances heat dissipation during extended sessions at the range or in the field, maintaining accuracy when cadence matters most. Designed for serious shooters seeking a seamless upgrade, the Proof Research barrel integrates seamlessly with Sig Cross components, enabling a true drop-in experience that preserves overall rifle balance and ergonomics. Whether youre chasing competitive scores or dependable field performance, this barrel delivers the precision-built reliability Proof Research is known for, helping you achieve repeatable groups and enhanced ballistic stability across varied shooting conditions.