The Model 597 is easily the most advanced autoloading rimfire rifle ever built, and the most technologically advanced breakthrough in autoloading rimfire rifle technology in 35 years. The difference starts with the 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. The Remington Exclusive Mossy Oak PInk camo, blaze orange, or FLX camo Model 597 will turn heads with their hot look, then proceed to make jaws drop with the astounding ability to punch tiny groups in fast-forward.These guns have 5R Rifling. The speed with which they zip out rounds is rivaled only by the striking appearances of our new additions to this venerable, semi-auto rimfire lineup. Easily the most advanced rimfire rifle ever built, the Model 597 represents the first technological breakthrough in the category in 35 years.