Gears of War: E-Day Guide | How to Upgrade Weapons

Here's a guide on how to upgrade weapons in Gears of War: E-Day.

Game Guide by Navid Kabbo on Oct 08, 2026

Gears of War: E-Day introduces a weapon customization system that allows players to improve their firearms with different modifications. Whether you're looking to increase ammunition capacity, improve accuracy, or enhance weapon handling, upgrading your equipment can make a noticeable difference during combat.

Gears of War E-Day Weapons

However, upgrading weapons works differently depending on whether you're playing Campaign or Horde Siege. Campaign upgrades are primarily tied to exploration and Supply Caches, while Horde Siege uses class progression and Weapon Parts.

This guide explains how to upgrade weapons in Gears of War: E-Day, including where to find upgrades, how to unlock Weapon Mods, and which improvements you should prioritize.

How to Upgrade Weapons in Gears of War: E-Day

Weapons are upgraded by equipping Weapon Mods, which modify different aspects of their performance. Some provide straightforward improvements, while others change how a weapon functions.

The upgrade process depends on the game mode:

Campaign: Discover Weapon Mods and additional mod slots through exploration, then equip them at Supply Caches.
Horde Siege: Unlock Weapon Mods through class progression, purchase them using Weapon Parts, and equip them through your loadout.
Versus: Weapon Mods are unavailable in competitive multiplayer.

Each weapon has its own compatible modifications, so the available upgrades depend on the firearm you're customizing.

How to Upgrade Weapons in Campaign

In Campaign, weapon upgrades are tied to exploration and the Supply Cache system. As you progress through the story, you'll discover modifications that can improve your existing weapons.

Some upgrades are found inside hidden Hardcases, while others are awarded for completing Secondary Objectives.

Once you've obtained a modification, you'll need to visit a Supply Cache to equip it.

How to Equip Weapon Mods at Supply Caches

Supply Caches are scattered throughout the Campaign, often appearing near COG positions or before major encounters.

Gears of War E-Day Using Supply Cache

To upgrade a weapon:

Locate and interact with a Supply Cache.
Open the weapon customization menu.
Select the firearm you want to upgrade.
Choose an available modification slot.
Select a compatible Weapon Mod.
Equip the modification to apply its effects.

Newly discovered upgrades are highlighted in the customization menu, making them easier to identify.

Keep in mind that some modifications may conflict with others, requiring you to replace an existing attachment.

Once equipped, the modification remains part of that weapon's saved configuration until you change it.

How to Unlock Weapon Mods in Horde Siege

Horde Siege uses a progression-based upgrade system. Instead of finding every modification through Campaign exploration, you'll unlock new options by leveling up your chosen class.

Each Horde Siege class features 30 progression levels at launch, with additional weapons, equipment, and modifications becoming available as you advance.

However, unlocking a Weapon Mod doesn't automatically make it usable.

You must first purchase it using Weapon Parts.

To upgrade weapons in Horde Siege:

Select a Horde Siege class.
Complete missions to earn Class XP.
Level up to unlock additional Weapon Mods.
Collect Weapon Parts through progression and missions.
Purchase your preferred modifications.
Equip the purchased upgrades through your loadout.

Your purchased weapon configurations are shared across Horde Siege classes. This means you won't need to purchase the same modification again when using that weapon with another class.

How to Get Weapon Parts

Weapon Parts are the main resource used to purchase Weapon Mods in Horde Siege.

Although you'll earn some through class progression, completing Horde Siege missions is the primary way to collect more.

One of the best methods is completing Secondary Objectives while working toward your main mission.

These optional activities include eliminating high-value targets, collecting COG intelligence, and completing additional battlefield objectives.

You can also obtain Weapon Parts from certain COG Resupplies.

However, there's one important requirement: your squad must successfully extract to keep the Weapon Parts collected during a mission.

If your squad fails to extract, the Weapon Parts earned during that run are lost.

For consistent progression, prioritize completing manageable objectives and extracting safely rather than taking unnecessary risks.

Best Weapon Upgrades to Prioritize

The best upgrades depend on your preferred weapons and combat style. However, certain improvements are useful across several weapon categories.

Assault Rifles

For weapons such as the Prototype Lancer and Hammerburst, prioritize modifications that improve stability, accuracy, and ammunition capacity.

These improvements are particularly useful during extended firefights, allowing you to maintain consistent damage without constantly repositioning or reloading.

Shotguns

Shotguns such as the Gnasher benefit from modifications that improve close-range effectiveness and handling.

Because shotgun encounters often happen at extremely short distances, upgrades that complement aggressive movement and quick engagements are worth considering

Precision Weapons

For long-range weapons such as the Longshot, prioritize modifications that improve aiming and precision.

Gears of War E-Day Longshot

Perfect Reload-related upgrades can also be valuable if you consistently perform successful Active Reloads.

Heavy Weapons

Heavy weapons are particularly useful against large Locust creatures and heavily armored enemies.

Consider modifications that improve ammunition efficiency or increase its effectiveness during sustained attacks.

Since heavy weapons can be difficult to replace during certain encounters, upgrades that help you make the most of their ammunition are especially useful.

Tips for Upgrading Weapons Efficiently

Weapon upgrades can make combat easier, but spending resources without a plan may leave you with modifications you rarely use.

Keep these tips in mind:

Upgrade frequently used weapons first: Prioritize firearms that regularly appear in your loadout.
Explore thoroughly: Search optional areas in Campaign for hidden upgrades.
Complete Secondary Objectives: These can reward additional modifications or Weapon Parts.
Extract safely: Don't risk losing an entire Horde Siege run for one additional objective.
Experiment with combinations: Some modifications work better together than others.
Check weapon compatibility: Not every attachment can be equipped on every firearm.

Rather than purchasing every available modification immediately, focus on improvements that address weaknesses in your current loadout.

Final Thoughts

Upgrading weapons in Gears of War: E-Day allows players to customize their firearms and improve their effectiveness against the Locust Horde.

Campaign players should focus on exploration, collecting upgrades, and visiting Supply Caches regularly. Meanwhile, Horde Siege players will need to level up their classes, collect Weapon Parts, and successfully extract to unlock additional customization options.

Prioritize weapons you use frequently, experiment with different modifications, and choose upgrades that complement your preferred combat style.

FAQ

Q. How do you upgrade weapons in Gears of War: E-Day?

A. You can upgrade weapons by equipping Weapon Mods. In Campaign, modifications are equipped at Supply Caches, while Horde Siege requires unlocking and purchasing them through class progression.

Q. How do you get Weapon Parts?

A. Weapon Parts can be earned through Horde Siege class progression, Secondary Objectives, and certain mission rewards. Your squad must successfully extract to keep the parts collected during a mission.

Q. Are weapon upgrades permanent?

A. Purchased Horde Siege Weapon Mods remain available for use, and weapon configurations are shared across classes. Campaign modifications can also be made at Supply Caches.