HK21 machine gun

Target entity: HK21 machine gun
Context triple: [Heckler & Koch, product, HK21 machine gun]

• A. MG 131 machine gun
  The MG 131 machine gun was a German 13 mm aircraft-mounted heavy machine gun used extensively by the Luftwaffe during World War II for defensive and offensive armament on various combat aircraft.
• B. MG 81 machine gun
  The MG 81 machine gun was a fast-firing 7.92 mm German aircraft-mounted weapon used extensively by the Luftwaffe during World War II.
• C. 7.62 mm M240 machine gun
  The 7.62 mm M240 machine gun is a belt-fed, gas-operated general-purpose machine gun widely used by U.S. and NATO forces for infantry support and as a mounted weapon on vehicles and aircraft.
• D. Maxim machine gun
  The Maxim machine gun is a pioneering late 19th-century recoil-operated, water-cooled heavy machine gun that became one of the first fully automatic weapons widely adopted by major armies around the world.
• E. M230 30 mm chain gun
  The M230 30 mm chain gun is a single-barrel, electrically driven automatic cannon primarily used on attack helicopters for high-rate, accurate fire against ground targets.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: HK21 machine gun
Target entity description: The HK21 machine gun is a German-designed, belt-fed general-purpose machine gun developed by Heckler & Koch and based on the G3 rifle’s roller-delayed blowback system.

• A. MG 131 machine gun
  The MG 131 machine gun was a German 13 mm aircraft-mounted heavy machine gun used extensively by the Luftwaffe during World War II for defensive and offensive armament on various combat aircraft.
• B. MG 81 machine gun
  The MG 81 machine gun was a fast-firing 7.92 mm German aircraft-mounted weapon used extensively by the Luftwaffe during World War II.
• C. 7.62 mm M240 machine gun
  The 7.62 mm M240 machine gun is a belt-fed, gas-operated general-purpose machine gun widely used by U.S. and NATO forces for infantry support and as a mounted weapon on vehicles and aircraft.
• D. Maxim machine gun
  The Maxim machine gun is a pioneering late 19th-century recoil-operated, water-cooled heavy machine gun that became one of the first fully automatic weapons widely adopted by major armies around the world.
• E. M230 30 mm chain gun
  The M230 30 mm chain gun is a single-barrel, electrically driven automatic cannon primarily used on attack helicopters for high-rate, accurate fire against ground targets.
• F. None of above. chosen