SMITH &WESSON 640-3

The Smith & Wesson Model 640-3 is a heavy-duty, all-steel J-frame revolver chambered in .357 Magnum and .38 Special (+P). Introduced in 2003, the "-3" engineering dash designation specifically marks the introduction of the internal safety lock (located just above the cylinder release) to the standard .357 Magnum stainless steel frame. Because it belongs to S&W's Centennial lineup, it features a completely concealed hammer, making it a double-action-only (DAO) firearm optimized for snag-free pocket carry and self-defense.