Annotation: The article is devoted to the study of the weapons’ technical characteristics influence on shooter's functional parameters. This influence can affect fire mission effectiveness. It is especially important for security forces whose fire mission specificities can demand fire to be more accurate or more rapid than in case with armed forces. The article defines the varieties of weapons’ technical characteristics and shooter functional parameters, as well as correlation between them that can significantly influence fire mission effectiveness. Defining this correlation can help to advance security forces' armament through creating (updating) weapons’ technical requirements. The general way to obtain weapons’ technical requirements (specifications) is represented.