The Federal Gas Riot Gun appears in the Battlefield 2: Special Forces expansion, used by each faction's Support kit to fire Tear Gas grenades. Tear gas is used to disorient enemy infantry. A player under the effect of tear gas will experience screen blur and coughing, and will completely deplete stamina, meaning that the ability to sprint and jump are impossible until the effect wears off. Tear gas can be countered with the use of gas masks, which are issued to every kit.