The S&W M617 Mountain Gun is a 10-shot, K-frame 36-ounce revolver with a barely-over 4-inch barrel. The “6” in “617” means the gun is fabricated from stainless steel. The 4.1” one-piece barrel has a tapered profile, making it slicker than the underlugged M617 revolver barrel. The factory-supplied stocks are high grade walnut, from Tyler Gun Works, in the “Bear Hug” pattern.