.40 S & W
The .40 S & W round began development after a tragic FBI shootout in 1986. In the investigation that followed, the Bureau decided that the standard rounds and firearms the agents were using were not quite up to the required task of bringing a person down with as little fuss as possible.
World Leading Reliability When You Need It Most
Smith and Wesson worked with Winchester to develop a .40 caliber firearm and round that would be as everyday practical as the older .38 Special ammunition, but with the stopping power required to keep law enforcement agents safe.
The round made its debut in 1990, was immediately a popular success, and it can be found on the hip of law enforcement agencies all over the world.