The JAK Thumper-656 conversion kit was added in MW3 and Warzone Season 4, introducing a powerful launcher that is incredibly strong in the right hands.
It was the fourth Aftermarket Part of Season 4, following on from the JAK Harbinger, JAK Requiem, and JAK Scimitar. When equipped, this conversion kit transforms the RGL-8, giving it an improved long barrel that can load a variety of unique ammunition.
This version of the RGL-80 can fire three ammo types: 40mm Slug, 40mm Sticky, and 40mm Drill Charge. These give the grenade launcher massively enhanced versatility, allowing it to function as a sort of utility secondary weapon.
It also happens to be the best Riot Shield counter in the game, which is a great reason to go and unlock it as soon as possible. Nobody likes playing against Riot Shields, but this gun makes dealing with them trivial.
How to get the JAK Thumper-656 conversion kit
The JAK Thumper-656 conversion kit can be unlocked through the Armory by activating it and then earning eight Armory points. One point is earned every time you finish a daily challenge, win a multiplayer match, survive in Warzone, or complete 3 contracts in Zombies.
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After you have unlocked the JAK Thumper-656, the Aftermarket Part can be equipped on the RGL-80 in the gunsmith’s Conversion Kit attachment slot. To do this, you’ll first need to reach weapon level 6 on the grenade launcher.
MW3 & Warzone Season 4 Week 4 challenges
Previously, the JAK Thumper-656 was unlocked by completing weekly challenges. These were removed when Season 5 started, with the AMP now available from the Armory instead.
Here are all of the challenges that you used to have to complete to unlock the JAK Thumper-656 when it was first released:
| MULTIPLAYER | ZOMBIES | WARZONE |
|---|---|---|
| Get 10 Kills against Operators who are blinded or stunned. | Get 300 Kills with Frost Damage with a recommended weapon | In Warzone Urzikstan, open 20 Loot Caches in the North-West region |
| Get 10 Operator Kills with a Bomb Drone or Mosquito Drone | Get 300 Explosive Kills with a recommended weapon | In Warzone Urzikstan, open 20 Loot Caches in the Southern region |
| Place top of the leaderboard 3 times | Get 2 Warlord Kills with a recommended weapon | In Warzone Urzikstan, open 20 Loot Caches in the Eastern region |
| Get 3 Operator Double Kills with Grenades or Launchers | Get 5 Kills with a Monkey Bomb 5 times | In Warzone Urzikstan, open 20 Loot Caches in the Central region |
| Get 20 Operator Kills while using Explosive Ammo | Get 300 Fire Damage Kills with a recommended weapon | In Warzone, place in the top 10 five times |
| Destroy 8 Aerial Killstreaks | Destroy 15 Counter UAVs in Mercenary Camps | In Warzone, complete 15 contracts |
| Get 3 Operator Kills after deaths | Get 50 Kills with a recommended melee weapon while Frenzied Guard is active | In Warzone, get 10 Operator Kills or Kill Assists with a recommended weapon |
For more great Call of Duty content, check out the best Warzone loadouts and MW3 loadouts to dominate your lobbies. Also, these breakdowns on the best snipers, assault rifles, and SMGs to use will make winning more Warzone matches a breeze.