The SG 542 is the 7.62x51mm battle rifle variant of the SG 500-series, sharing the piston operating system and folding stock of the 5.56mm SG 540 family. Type: Rifle Action: Semi-Automatic Caliber: 7.62x51mm NATO Capacity: 20 Year introduced: 1981, Switzerland Weight: 124 oz Overall length: 40.5" Status: Discontinued Military use: Yes Intended use: Military, Collecting