The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) developed the concept of the CGIC, and the U.S. Justice Department’s Bureau of Justice Assistance (BJA) provided funding for the planning and implementation of the CGIC. In Los Angeles, the ATF, the LAPD, and all the partners implemented a CGIC in the 77th Street Division, one of 21 patrol stations in the Department. The CGIC became fully operational in January 2018. It began to use “actionable intelligence” based on National Integrated Ballistic Information Network (NIBIN) leads and hits. In October 2018, the LA CGIC was expanded to include three other South Bureau divisions. CGICs require collaboration among several agencies with the same multi-pronged goals, i.e., real-time collection, processing, and analysis of crime guns and cartridge casings; identification of active shooters; disruption of crime; and violence prevention. The evaluation found a direct association between the start of the LA CGIC and 1) a decrease in homicides and firearm-related homicides in the 77th Street Division; 2) a decrease in firearm-related robberies in the 77th Street Division and the rest of South Bureau; 3) an increase in firearm-possession arrests in 77th Street Division; and 4) a decrease in the ratio of violent crimes involving a firearm in the 77th Street Division and the rest of South Bureau.