The HK21 is a light machine gun featured in the Call of Duty: Black Ops Nazi Zombies maps Kino der Toten, "Five", Ascension, and Call of the Dead. It bears similarities to the M1919 Browning from Call of Duty: World at War, as it has low rate of fire, high damage and long reload time.
HK 3

The HK21 can be found in the Nazi Zombies game mode and is only obtained from the Mystery Box. It starts with a magazine size of 125 rounds and with an extra 500 rounds. When Pack-A-Punched, it becomes the "H115 Oscillator". This increases the magazine size to 150 rounds while increasing ammo capacity along with the usual additions.

The low rate of fire, very high magazine size and high reserve capacity makes ammo less of an issue for the HK21 than for other weapons. However, the very slow reload time makes Speed Cola useful when using this weapon. The low rate of fire also makes Double Tap Root Beer beneficial, but not a necessity. Be aware that Double Tap Root Beer increases the upwards recoil a significant amount.

Due to this weapon's high power and large magazine, it is arguably one of the best non-Wonder Weapons in Zombies mode.

Weapons of Zombies
Bolt-Action Rifles SpringfieldArisakaKar98kPTRS-41
Semi-Automatic Rifles Gewehr 43M1 GarandM1A1 Carbine
Assault Rifles STG-44M16M14FAMASGalilAUGFN FALCommandoG11
Submachine Guns ThompsonMP40Type 100PPSh-41MP5KAK-74uPM63MPLSpectre
Light Machine Guns BARMG42FG42M1919 BrowningHK21RPKM60
Sniper Rifles DragunovL96A1
Shotguns M1897 TrenchgunDouble-Barreled ShotgunOlympiaStakeoutSPAS-12HS-10
Launchers PanzerschreckM72 LAWChina Lake
Handguns M1911.357 MagnumPythonCZ75
Specials M2 FlamethrowerBallistic KnifeCrossbow
Wonder Weapons Ray GunWunderwaffe DG-2Monkey BombThundergunWinter's HowlGersch DeviceMatryoshka DollsV-R11Scavenger31-79 JGb215Wave GunQuantum Entanglement DeviceJet GunSliquifierBlundergatHell's RetrieverRay Gun Mark IIParalyzerTime BombStaff of IceStaff of WindStaff of FireStaff of Lightning
Equipment Molotov CocktailStielhandgranateM67 GrenadeSemtexBouncing BettyClaymoreSpikemoreP.E.SHackerKnifeBowie KnifeSickle
Power-Up Weapons Death MachineWunderwaffe DG-2
Cut/Mod Weapons Dirty HarryBRAAAINS...Walther P38Mosin-NagantAK-47Type 99

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