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 Model 3 Wesson–made revolvers (which Smith & Wesson had already produced), and delaying (or refusing) payment for the handguns that had already been delivered. The U.S. Army adopted the .44 S&W American caliber Smith & Wesson Model 3 revolver in 1870, making the Model 3 revolver the first standard-issue cartridge-firing revolver in US service. Most military pistols until that point were black powder cap and ball revolvers, which were (by comparison) slow, complicated, and susceptible to the effects of wet weather. In 1875, the US Ordnance Board granted Smith & Wesson a contract to outfit the military with Model 3 revolvers incorporating