The SG553, a slightly improved version of the SG552, is the SBR (Short Barrel Rifle) version of the SIG SG550. It fires the 5.56x45mm NATO round from a 5, 10, 20 or 30 round magazine at 700 RPM. The LB version sports a slightly longer barrel to mount bayonets and grenade launchers. The SIG SG550 (Sturmgewehr 90) is the official rifle of the Swiss Army and was designed for arctic conditions, making it a very reliable weapon. The SG553 was made for more urban environments, where its shorter length makes it a formidable close range tool. Even with its short barrel, the rifle is highly accurate out to ~200–250 meters. It is used by the Alliance of Nations' Joint Police Agency and the Axis of Empires' Royal Police Guard

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