Smith & Wesson increased scrutiny due to the frequent use of its firearms in mass shootings such as the 2018 Stoneman Douglas High School shooting, in which 19-year-old Nikolas Jacob Cruz used a Smith & Wesson AR-15 style rifle, the semi-automatic M&P15. The same weapon was used in the 2015 San Bernardino attack and the 2012 Aurora shooting. Smith & Wesson has produced revolvers over the years in several standard frame sizes. "M" refers to the small early Ladysmith frame, "I" to the small .32 frame, "J" to the small .38 frame, "K" to the medium .38 frame, "L" to medium large, and
Smith & Wesson its most widely used revolver, the .38 Military & Police (also known as the Smith & Wesson Model 10). With over 6 million produced, it became the standard sidearm of American police officers for much of the 20th century. An additional 1 million of these guns were made for the US Military during World War II. The post-war periods in the 20th century were times of great innovation for the company. In 1935 Smith and Wesson released the Smith & Wesson Model 27 which was the first revolver chambered for .357 Magnum. It was designed as a more powerful handgun