Complete guide to unlocking and mastering the JAK Widemouth Barrel for the MORS sniper rifle in Modern Warfare 3 and Warzone
What is the JAK Widemouth Barrel?
Here is your definitive guide to acquiring the JAK Widemouth Barrel conversion kit in Modern Warfare 3 and Warzone, a modification that radically alters the MORS railgun sniper into a powerful, futuristic shotgun.
The JAK Widemouth Barrel is categorized as an Aftermarket Part, a special attachment type that fundamentally changes a weapon’s behavior. Designed exclusively for the MORS, it converts the long-range precision instrument into a short-range, high-impact blunderbuss. Unlocking this kit is a straightforward process, making it an accessible and fun addition to your arsenal.
Debuting as a headline addition in Season 5, this part leads a wave of new Aftermarket Parts introduced to both Multiplayer and Warzone modes, offering players novel ways to customize their gameplay experience.
When installed on the MORS, this conversion kit reimagines the weapon as a Blunderbuss, a classic close-quarters shotgun last seen in Call of Duty: WWII. The transformation sacrifices all effective range but delivers devastating power up close. While its limitations prevent it from being a reliable primary weapon, it excels as a potent secondary option for clearing rooms, defending objectives, or finishing off wounded enemies in tight urban combat.
Unlock Requirements & Step-by-Step Guide
The JAK Widemouth Barrel will not dominate the competitive meta due to its niche range profile, but it provides immense fun, particularly in Multiplayer where its one-shot-kill potential can be fully realized. In the vast landscapes of Warzone, its utility drops significantly; dedicated shotguns such as the JAK Wardens or the Haymaker offer better consistency and versatility for battle royale engagements.
To add this unique tool to your armory, you must complete any five of the weekly challenges available during Season 5, Week 1. The beauty of this system is its flexibility: you can mix and match challenges across Multiplayer, Warzone, and Zombies modes. Focus on the quickest objectives from each playlist to expedite the unlock process.
A crucial, often overlooked prerequisite is that your MORS must be at Weapon Level 19 before the Conversion Kit attachment slot becomes available. Grind this level in advance through normal use or in a mode like Zombies for faster weapon XP. Once you have both the unlocked kit and the required weapon level, navigate to the MORS’s attachment menu and equip the JAK Widemouth Barrel in the designated slot.
Your mission is clear: select and finish any five challenges from the Week 1 roster to claim the JAK Widemouth Barrel. Prioritize challenges that align with your preferred playstyle or current objectives for maximum efficiency.
Strategic Analysis & Best Use Cases
Understanding the strategic niche of this weapon is key to success. In Multiplayer on small to medium-sized maps, the converted MORS becomes a devastating tool for holding chokepoints like doorways or capturing objectives in modes like Hardpoint or Domination. Its one-shot capability provides a psychological edge and can quickly swing a close game.
In Warzone, its application is far more limited. It can be effective in the final circles where play areas are confined, or for aggressively pushing buildings in urban zones like Downtown or Superstore. However, for general Warzone play, you are almost always better served by a meta SMG or a dedicated shotgun with better range and fire rate.
Common Mistake: The biggest error players make is treating this like a standard shotgun and engaging at mid-range. Its damage falloff is extreme. Always close the distance before firing. Another pitfall is using it as a primary weapon in loadouts designed for versatility; it should complement a longer-range primary like an assault rifle or tactical rifle.
For more in-depth weapon guidance, explore our curated lists for the best Warzone loadouts and MW3 loadouts. Additionally, our expert breakdowns of the best snipers, assault rifles, and SMGs will provide the meta knowledge needed to secure more victories.
Advanced Tips & Optimization
To maximize the blunderbuss’s potential, pair it with attachments that boost sprint-to-fire speed, tactical sprint duration, and hip-fire accuracy. A laser and a stock focused on mobility are excellent choices. Since range is already sacrificed, avoid attachments that further penalize mobility or handling.
Master movement techniques like slide-canceling and jump-shotting around corners to close gaps unexpectedly. The weapon’s hip-fire spread is wide, so aim for center mass at close range rather than precision-aiming. In Warzone, consider using it with a Loadout that includes a Munitions Box to ensure you have ample shells for prolonged fights in confined spaces.
Know when to switch back. If you find yourself in open terrain or facing multiple enemies at varied distances, immediately swap to your primary weapon. The JAK Widemouth Barrel is a situational tool, and recognizing those situations is the mark of an advanced player.
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