The Smith & Wesson Model 437 is a double-action, J-frame revolver that fires .38 Special +P rounds. It features a 1.87" barrel, a stainless steel 5-shot cylinder, fixed front and rear sights, an Airweight aluminum frame, and synthetic grips that help reduce recoil and provide a firm grip. It is small enough to fit in a pocket (with the proper pocket holster) and powerful enough to satisfy FBI performance standards when used with high-quality ammo. Small J-frame revolvers are both easy and simple to use, and they are intended to fire a full power round. It is not surprising that the Smith & Wesson J-Frame is known as the most popular small-frame defense handgun on the market considering that it's offered in a range of calibers and three different hammer designs.