SIG SG 540 — Swiss 5.56mm assault rifle designed for export. Gas-operated with rotating bolt; accurate and reliable. Licensed to Manurhin in France and adopted by several African and South American nations. Parent of the SG 542 (7.62) and SG 543 (carbine) families. Type: Rifle Action: Gas-Operated Caliber: 5.56x45mm NATO Capacity: 10 Year introduced: 1977, Switzerland Weight: 112 oz Overall length: 39.5" Status: Discontinued Military use: Yes Intended use: military