MW3 JAK Backsaw Kit
Screenshot by Prima Games

How to Get JAK Backsaw Kit in MW3

More ammo, more bullets.

The JAK Backsaw Kit is an Aftermarket Part introduced in Call of Duty: Modern Warfare 3 Season 2 that gives the Holger 556 assault rifle a larger magazine and fires two bullets per shot. Here is how to get the JAK Backsaw Kit in MW3.

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How to Unlock JAK Backsaw Kit in MW3

The JAK Backsaw Kit can be unlocked by completing five Season 2 Week 6 challenges. The five weekly challenges must be done before the end of Season 2, then the part will move to the Armory with different requirements to unlock.

There are a total of 21 Week 6 challenges among multiplayer, Zombies, and the Warzone battle royale modes. Only five in any of the categories need to be completed to get the JAK Backsaw Kit. Here are all the Season 2 Week 6 challenges that can be completed:

MW3 Multiplayer

  • Get 15 Operator Hipfire Kills with Recommended Assault Rifles.
  • Get 10 Operator Hipfire Kills with Recommended LMGs.
  • Get 30 Operator Hipfire Kills with Recommended SMGs.
  • Get 10 Operator Double Kills with Recommended SMGs.
  • Get 20 Operator Tac Stance Kills with Recommended LMGs.
  • Get 20 Operator Kills while Aiming Down Sights with a Recommended Shotgun.
  • Get 15 Operator Point Blank Kills with the Holger 556.

MW3 Zombies

  • Get 250 Kills in Full-Auto Fire Mode with a Recommended Battle Rifle.
  • Get 250 Critical Kills with a Pack-A-Punched Recommended Weapon.
  • Get five Special Zombie Critical Kills with a Recommended Weapon.
  • Get 250 Kills with a Silenced Recommended Battle Rifle.
  • Get 150 Kills with a Pack-A-Punched Longbow.
  • Get 250 Kills with the Haymaker at Epic [Purple] or Higher Rarity.
  • Get 300 Kills with a Pack-A-Punched Holger 556.

MW3 Warzone Battle Royale

  • In Warzone Fortune’s Keep, open 20 Loot Caches in the North Region (Gatehouse, Keep, Terraces).
  • In Warzone Fortune’s Keep, open 20 Loot Caches in the South (Ground Zero).
  • In Warzone Fortune’s Keep, open 20 Loot Caches in the East (Konni Outpost, Lighthouse, Pier, Winery).
  • In Warzone Fortune’s Keep, open 20 Loot Caches in the West (Graveyard, Overlook, Town).
  • In Warzone, place in the top 10 five times.
  • In Warzone, complete 15 Contracts.
  • In Warzone, get 40 Operator Kills or Kill Assists with a Recommended Weapon.

For unlocking more Modern Warfare 3 Aftermarket parts, check out how to get the JAK Burnout Kit during Season 2.


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