SIG SG 543 — carbine variant of the SG 540 with shortened 14.3-inch barrel and folding stock. Used by Swiss military and special forces; also exported to several nations. Compact 5.56mm precision with Swiss construction quality. Type: Carbine Action: Gas-Operated Caliber: 5.56x45mm NATO Capacity: 10 Year introduced: 1979, Switzerland Weight: 112 oz Overall length: 39.5" Status: Discontinued Military use: Yes Intended use: military, law_enforcement