The Model 638 is a single-action/double-action revolver built on a small J-Frame, shooting a .38 S&W Special caliber with a 5-round cylinder capacity. Even though the gun is small, it is designed to fire a full power round. This model is a variation of the Model 38 Bodyguard Airweight that combines classical features with modern advancements. With its overall length of 6.3 inches, it’s perfect for pocket carry. The front sight of this firearm is integral and the rear sight is fixed. The barrel and the cylinder are made of stainless steel, while the frame is made of aluminum alloy material and it is quite lightweight. The gun also comes with a snag-free enclosed hammer. After all, this is a very small-sized revolver ideal for concealed carry and self-defense, but still very powerful, reliable, and surprisingly accurate.