The Model 597 Kryptek Camo is easily the most advanced autoloading rimfire rifle ever built. The difference starts with our proprietary bolt-guidance system, which features a unique set of twin tool-steel guide rails for better stability, feeding reliability and greater out-of-the-box accuracy. he sear of the Model 597 features an exclusive nickel-TeflonĀ® plating for smooth, dependable operation and an ultra-crisp trigger pull. Receivers are grooved for standard rimfire mounts and tapped/drilled for Weaver-style bases. Completing the breakthrough design are an innovative last-shot hold open magazine feature and our patented, easy-to-use staggered-stack magazine. 16.5" barrel with threaded muzzle.