The SIG Sauer SG543 is a switzerland-made select-fire carbine chambered in 5.56x45mm NATO, introduced in 1979. Primary use: military. Type: Carbine Action: Select-Fire Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 1979, Switzerland Weight: 112 oz Overall length: 37" Status: Discontinued Intended use: military