Mods are items that can be applied to weapons to receive various benefits. They are applied to weapons in the Weapons menu, which is found in the Unlocks tab.

Basics

The Mods page for the M82.

Mods can be obtained by finishing waves on any difficulty; the higher the difficulty, the higher the chance a mod will drop upon a wave completion. You can also buy mods via ROBUX. Similarly to Perks, every weapon has a specific number of mod slots that can be increased by either leveling the weapon up (1 slot every 3 levels, up to Level 12) through gameplay with an additional slot being unlockable by beating Wave 30 on Impossible mode. Like locking perks, mods installed in weapons will be locked and receive a red border once you leave spawn for the first time in a game. They can only be removed once the current game session ends.

When a mod is received, both the tier and the type of the mod are randomized, with higher tiers being rarer. Every mod has five tiers, with higher tiers providing stronger bonuses. All mods can both positively and negatively impact a weapon; negative effects are only seen starting with Tier 2 mods. Some mods can only be applied to specific types of weapons, and no mod can be applied to utility or consumable items. You can upgrade a mod to a tier higher if you own 4 of the same mod of the same tier. Recycling a mod gives 2 random mods of a tier lower.

It can be assumed that the formula for mod bonuses is PositiveStat*Tier & NegativeStat*(Tier-1). Mod bonuses are additive with perk bonuses. Additionally any mod that increases range will have that bonus halved for melee weapons and flamethrowers.

Mods

Mod Name Tier 1 (74.5%) Tier 2 (19.2%) Tier 3 (4.8%) Tier 4 (1.2%) Tier 5 (0.3%) Incompatible with
Long Range.png
Sniper Mod

Accuracy +2% Range +2%

Accuracy +4%
Range +4%
Attack Speed -1.25%

Accuracy +6%
Range +6%
Attack Speed -2.5%

Accuracy +8%
Range +8%
Attack Speed -3.75%

Accuracy +10%
Range +10%
Attack Speed -5%

N/A
Deep Mags.png
Loaded Mod

Magazine Size +2.5%

Magazine Size +5%
Max Ammo -1.25%
Reload Speed -0.75%

Magazine Size +7.5%
Max Ammo -2.5%
Reload Speed -1.5%

Magazine Size +10%
Max Ammo -3.75%
Reload Speed -2.25%

Magazine Size +12.5%
Max Ammo -5%
Reload Speed -3%

Weapons w/ infinite or no Ammo Reserve
Bullet storm.png
Rapid Mod

Attack Speed +1.5%

Attack Speed +3%
Damage -0.5%

Attack Speed +4.5%
Damage -1%

Attack Speed +6%
Damage -1.5%

Attack Speed +7.5%
Damage -2%

N/A
Long shot.png
Volley Mod

Attack Speed +1%
Reload Speed +1%

Attack Speed +2%
Reload Speed +2%
Velocity -2.5%

Attack Speed +3%
Reload Speed +3%
Velocity -5%

Attack Speed +4%
Reload Speed +4%
Velocity -7.5%

Attack Speed +5%
Reload Speed +5%
Velocity -10%

Weapons w/ no Velocity
Bullet hell.png
Spray Mod

Attack Speed +1.5%

Attack Speed +3%
Accuracy -1.25%

Attack Speed +4.5%
Accuracy -2.5%

Attack Speed +6%
Accuracy -3.75%

Attack Speed +7.5%
Accuracy -5%

Melee Weapons
Lucky Charm.png
Lucky Mod

Critical Chance +0.5%

Critical Chance +1%
Damage -0.6%

Critical Chance +1.5%
Damage -1.2%

Critical Chance +2%
Damage -1.8%

Critical Chance +2.5%
Damage -2.4%

Launchers
Unlucky Shot.png
Unlucky Mod

Critical Damage +5%

Critical Damage +10%
Critical Chance -0.5%

Critical Damage +15%
Critical Chance -1%

Critical Damage +20%
Critical Chance -1.5%

Critical Damage +25%
Critical Chance -2%

Launchers
Heavy Bullets.png
Heavy Mod

Damage +1%

Damage +2%
Attack Speed -0.75%

Damage +3%
Attack Speed -1.5%

Damage +4%
Attack Speed -2.25%

Damage +5%
Attack Speed -3%

N/A
Blood Thirst.png
CQB Mod

Damage +1%

Damage +2%
Range -2.5%
Accuracy -0.5%

Damage +3%
Range -5%
Accuracy -1%

Damage +4%
Range -7.5%
Accuracy -1.5%

Damage +5%
Range -10%
Accuracy -2%

Melee Weapons
Glass Cannon.png
Glass Mod

Damage +1%

Damage +2%
Resistance -1.25%

Damage +3%
Resistance -2.5%

Damage +4%
Resistance -3.75%

Damage +5%
Resistance -5%

N/A
Danger Close.png
MOAB Mod

Damage +0.5%
Explosive Radius +0.5%

Damage +1%
Explosive Radius +1%
Reload Speed -0.75%

Damage +1.5%
Explosive Radius +1.5%
Reload Speed -1.5%

Damage +2%
Explosive Radius +2%
Reload Speed -2.25%

Damage +2.5%
Explosive Radius +2.5%
Reload Speed -3%

Weapons w/ no Radius
Fireworks.png
Explosive Mod

Explosive Radius +1%

Explosive Radius +2%
Damage +0.5%

Explosive Radius +3%
Damage +1%

Explosive Radius +4%
Damage +1.5%

Explosive Radius +5%
Damage +2%

Weapons w/ no Radius
Bandolier.png
Ammo Mod

Magazine Size +1%
Max Ammo +1.5%

Magazine Size +2%
Max Ammo +3%
Reload Speed -1.25%

Magazine Size +3%
Max Ammo +4.5%
Reload Speed -2.5%

Magazine Size +4%
Max Ammo +6%
Reload Speed -3.75%

Magazine Size +5%
Max Ammo +7.5%
Reload Speed -5%

Melee Weapons
Profiteer.png
Greed Mod

Money +1%

Money +2%
Damage -0.5%
Attack Speed -0.5%

Money +3%
Damage -1%
Attack Speed -1%

Money +4%
Damage -1.5%
Attack Speed -1.5%

Money +5%
Damage -2%
Attack Speed -2%

N/A
Time freeze.png
End Mod

Damage +0.6%
Attack Speed +0.6%

Damage +1.2%
Attack Speed +1.2%
Money -1.25%

Damage +1.8%
Attack Speed +1.8%
Money -2.5%

Damage +2.4%
Attack Speed +2.4%
Money -3.75%

Damage +3%
Attack Speed +3%
Money -5%

Melee Weapons
Deep Impact.png
Penetration Mod

Pierce +1%
Armor Pierce +3%

Pierce +2%
Armor Pierce +6%
Magazine Size -1.25%

Pierce +3%
Armor Pierce +9%
Magazine Size -2.5%

Pierce +4%
Armor Pierce +12%
Magazine Size -3.75%

Pierce +5%
Armor Pierce +15%
Magazine Size -5%

Weapons w/ <5 Shots in Mag
SpeedLoad.png
Swift Mod

Reload Speed +1.5%

Reload Speed +3%
Magazine Size -0.75%

Reload Speed +4.5%
Magazine Size -1.5%

Reload Speed +6%
Magazine Size -2.25%

Reload Speed +7.5%
Magazine Size -3%

Weapons w/ <5 Shots in Mag

Juggernaut.png
Tank Mod

Resistance +1.5%

Resistance +3%
Attack Speed -0.75%

Resistance +4.5%
Attack Speed -1.5%

Resistance +6%
Attack Speed -2.25%

Resistance +7.5%
Attack Speed -3%

N/A
Stopping power.png
Perfect Mod

Damage +0.4%
Attack Speed +0.4%
Reload Speed +0.4%

Damage +0.8%
Attack Speed +0.8%
Reload Speed +0.8%

Damage +1.2%
Attack Speed +1.2%
Reload Speed +1.2%

Damage +1.6%
Attack Speed +1.6%
Reload Speed +1.6%

Damage +2%
Attack Speed +2%
Reload Speed +2%

N/A
Direct hit.png
Velocity Mod

Velocity +3%
Range +2%

Velocity +6%
Range +4%
Damage -0.25%

Velocity +9%
Range +6%
Damage -0.5%

Velocity +12%
Range +8%
Damage -0.75%

Velocity +15%
Range +10%
Damage -1%

N/A
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