Counter Strike Online Wiki

HK121 is a general-purpose Common grade machine gun in Counter-Strike Online.


Limited This item is no longer obtainable. Introduced in 2010, this is a Germany GPMG fed with 120 rounds of 7.62 NATO. It is equipped with a low power lens scope for middle range engagement. It has an upgraded variant that can be obtained through Upgrade Event.


  • High accuracy
  • High rate of fire
  • Light weight
  • Has usable scope
  • Can be upgraded
  • High clip capacity


  • Low damage for a machine gun
  • Expensive price
  • High recoil
  • Obtainable through Crafting only
  • Low reserved ammunation

HK121 Confirmed Set[]

HK121 Confirmed Set

With this set, the player can get the HK121 for sure from Craft using the Perfect Pick Recipe item, but the durability will determine the period of the weapon.

  • The user can obtain the HK121 for permanent if having the period of more than 1000 days.

Release date[]

This weapon was released for Upgrade Event on:

  • South Korea: 14 January 2016.
  • Taiwan/Hong Kong: 19 January 2016.
  • China: 20 January 2016.
  • Japan: 27 January 2016.
  • Indonesia: 27 July 2016.
  • CSN:Z: 9 November 2016.


HK121 Custom
HK121 Custom
Main article: HK121 Custom

This is an upgraded version of the HK121 fed with 150 rounds of 7.62 NATO. The scope was replaced by a grenade launcher to increase the firepower and consequently facilitate the hassle of dealing with multiple targets.

Comparison to NG-7[]

  • Cheaper (-$100)
  • Lighter (-2%)
  • Has usable scope
  • Can be upgraded
  • Same damage (27)
  • Same stun and knockback powers
  • Same ammo type (7.62 NATO)
  • Same reloading time (4s)
  • Lower accuracy (-5%)
  • Higher recoil (+10%)
  • Lower rate of fire (-1%)
  • Lower magazine size (-30)



  • GIGN: Seen in posters.


  • Elite Crew: Seen wielding HK121 Custom in posters.


Shoot sound


  • HK121 is also known as HK MG5, as designated by the German Armed Forces.
  • The reload style is the nearly similar with PKM.

External links[]