The SG 540 is the original assault rifle platform that preceded the SG 550, serving as the design ancestor for all SG 5xx rifles and exported to several Latin American nations. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 20 Year introduced: 1977, Switzerland Weight: 110 oz Overall length: 38.9" Status: Discontinued Military use: Yes Intended use: Military, Collecting