The first week of Season 5 for Call of Duty: Modern Warfare 3 has released one of the game's weirdest aftermarket parts thus far. If you complete five of this week's challenges, you'll unlock a blunderbuss conversion kit for the MORS sniper rifle. The future melds with the past to create something quite odd but surprisingly effective in Hardcore playlists.

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But as with most aftermarket parts, you'll need to complete some challenges beforehand. This guide explains how to unlock this attachment and showcases how to complete all 21 of this week's challenges as quickly as possible, including those found in Multiplayer, MWZ, and Warzone.

Week 1 Challenge Reward

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Completing any five challenges this week will unlock the JAK Widemouth Barrel for the MORS. This turns the gun into a magnetic blunderbuss, firing a salvo of ball bearings that act just like a shotgun. You cannot fully ADS with this attachment, and the damage falloff of the MORS becomes rather significant. Use this weapon like a shotgun for optimal results.

Multiplayer Challenges

Multiplayer Challenges

Challenge

XP Reward

Get 40 operator kills

2,500 XP

Get 30 longshot kills.

5,000 XP

Get 25 midair kills.

5,000 XP

Get 20 hipfire kills with SMGs.

5,000 XP

Get 10 one-hit kills with sniper rifles.

7,500 XP

Get 5 clean kills with shotguns.

7,500 XP

Get 3 triple kills with SMGs.

10,000 XP

Tips

  • You no longer need to use recommended weapons. Use any weapons you like.
  • Clean kills require you to eliminate a target without them damaging you.
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Zombies Challenges

MWZ Challenges Challenge XP Reward Get 250 kills. 2,500 XP Get 250 kills with shotguns at Epic (purple) rarity or higher. 5,000 XP Get 250 kills with Pack-A-Punched shotgun. 5,000 XP Get 100 hipfire kills with an SMG. 5,000 XP Get 200 one-hit kills with sniper rifles. 7,500 XP Get 10 kills without taking damage 20 times wi 7,500 XP Get 500 triple kills with the FJX Horus. 10,000 XP

Tips

  • The FJX Horus with the JAK Scimitar Kit should make short work of these challenges.

Warzone Challenges

Battle Royale Challenges

Challenge

XP Reward

Open 75 loot caches.

2,500 XP

In Urzikstan, get 15 kills in the northwest region (Resort, Power, Seaport, Cargo).

5,000 XP

In Urzikstan, get 15 kills in the southern region (City, Suburbs, Manor).

5,000 XP

Complete 15 contracts in Warzone.

5,000 XP

In Urzikstan, get 15 kills in the eastern region (Military Base or Farms).

7,500 XP

In Urzikstan, get 15 kills in the central region (Old Town, Low Town).

7,500 XP

In Warzone, place in the top ten 7 times.

10,000 XP

Tip

  • The kill challenges must be completed in Urzikstan.
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