The SIG SG 543 is the compact carbine variant of the SG 540, fitted with an 11-inch barrel and side-folding stock. Intended for vehicle crews and special operations use within the SG 540 export family. Type: Rifle Action: Semi/Full-Auto Caliber: 5.56x45mm Capacity: 30 Year introduced: 1977, Switzerland Weight: 112 oz Overall length: 24" Status: Discontinued Military use: Yes Intended use: military, special_operations