The JAK Thumper-656 is a new Aftermarket Part introduced in Season 4 of Call of Duty: Modern Warfare 3 and Warzone that offers more ammunition types for the RGL-80 grenade launcher. Here is how to get the JAK Thumper-656 in MW3 and Warzone.
How to Unlock JAK Thumper-656 in MW3 and Warzone
Screenshot by Prima Games
The JAK Thumper-656 can be unlocked by completing five Season 4 Week 4 challenges. It will be available to unlock through weekly challenges until Season 4 ends, then players will have to unlock it from the Armory once the season is over.