lighter model 317 in the late 2000s. Older Kit Guns have been replaced, and though some come in larger calibers, they are even lighter. This is due to advances in titanium and aluminum construction. There is the Model 317 .22 Long Rifle (.22LR) AirLite Kit Gun, the Model 337 .38 Special AirLite Kit Gun, and a .44 Special Kit Gun, the Model 396 AirLite Mountain Lite Kit Gun. These revolvers have aluminum alloy frames and cylinders made of titanium (except the Model 317, whose cylinder is aluminum). While titanium is considerably lighter than steel, it is just as strong. The aluminum barrels have a steel liner. Snub barrel variation The Smith & Wesson Model 317 is the lighter, shorter version of the Model 317 Kit Gun. It is extremely light at just 10.8 oz / 306.2 g (unloaded). The model 63 stainless also comes in an 8-shot, 3-inch barrel version. References Guns, October 2000 .22 LR revolvers Smith & Wesson revolvers Survival guns