The SIG556R brought the SIG556 platform to 7.62x39mm using a dedicated AK-compatible magazine, offering the SIG556's piston reliability in the AK cartridge. Limited production before the entire SIG556 line was discontinued. Type: Rifle Action: Semi-Automatic Caliber: 7.62x39mm Capacity: 30 Year introduced: 2013, USA Weight: 8.2 oz Overall length: 36.5" Status: Discontinued Intended use: hunting, patrol