Designed for steady, repeatable performance in varied environments, the PROOF RESEARCH Proof Research 134498 Bolt Action Barrel Pre-Fit 308 Win 20" 1:10" Twist (5 Groove), 5/8"-24 tpi Threaded, Stainless Steel, Drop-In Design for Sig Cross emphasizes functional reliability and straightforward operation. This barrel is crafted for easy installation, eliminating the need for gunsmith intervention, and guarantees correct headspacing at home. Ideal for range training and recreational shooting, this barrel enhances your shooting experience with its precision engineering. PROOF RESEARCH is renowned for its innovative barrel designs that offer reliability and performance.