Cambodia is a typical example of a post-conflict country where the lack of easily available data to guide policy design is one of the fundamental challenges to be addressed. While Cambodia has benefited from sustained Small Arms and Light Weapons (SALW) collection and destruction programmes since 1998, these have not been accompanied by any data analysis on the impact of gun proliferation and use or on these destruction programmes. In 2005, the Small Arms Survey (SAS) collected data on firearm morbidity and mortality spanning the last ten years. The objective was to develop methods that can be used for data generation in countries without systematic data collection. Using hospital admissions records and a review of the main English newspaper, the data shows that collection and destruction programmes have made a significant difference to human security in Cambodia. The study also reveals that even where no official data is available in a country, researchers can often derive useful indicators.