Enhancement

Enhancements are an equippable gear type introduced in Borderlands 4, replacing artifacts. They provide bonuses to player stats and skills (stat bonuses), as well as game-changing boosts to guns that utilize their respective manufacturer-licensed part (weapon-part bonuses).

Drop mechanics[]

Once the player reaches level 15, enhancements begin to drop from enemies; from level 25 onward, drops may include firmware.

Rarity controls the number of bonuses:

Rarity	# of Weapon-Part Bonuses	# of Stat Bonuses
Common	1	0
Uncommon	1	1
Rare	1	2
Epic	1	3
Legendary	2	2

When a non-Legendary enhancement is generated:

Weapon-part bonuses are assigned. Common enhancements have a single bonus and legendaries have two. Both are fixed; enhancements with the same model name will always have the same weapon part bonuses.
Up to three stat bonuses are randomly rolled from a preset list.

Examples[]

Stat Bonuses[]

Enhancements can have up to three stat bonuses, depending on rarity. Each bonus will apply either to all weapons or to specific weapon types.

List of Stat Bonuses[]

Accuracy
Aiming Down Sights/Scope (ADS) Proficiency
Critical Damage
Damage
Equip Speed
Fire Rate
Magazine Size
Reload Speed
Splash Damage
Splash Radius
Status Effect Damage
Status Effect Chance

Weapon Part Bonuses[]

Each manufacturer provides a pool of four weapon-part bonuses that enhance or modify how its manufacturer-related guns work. They may:

Boost guns stats conditionally (e.g, CoV's Cold Open, Smelter) or unconditionally (e.g, Torgue's Head Ringer).
Increase chance for guns to trigger manufacturer traits (e.g, Jakob's Piercer).
Grant additional effects (e.g, Daedalus' Backup Plan).

Weapon-part bonuses apply to both weapons made by a manufacturer and to weapons by other manufacturers using their licensed parts.

Legendaries[]

All legendary enhancements have a unique, fixed combination of two weapon-part bonuses. Legendary enhancements exist for all possible combinations of two manufacturer weapon-part bonuses, with the exception of COV and Vladof.

List of Weapon Part Bonuses By Manufacturer[]

Manufacturer	Weapon-Part	Guns with licensed parts from this manufacturer
Atlas	Protractor	have a 50% Chance to not consume Ammo while Target Lock is active.
	Sure Shot	automatically fire a Tracker Dart projectile every 25s.
	Tracker Antenna	gain +40% Fire Rate while Target Lock is active.
	Trauma Bond	gain +30% Damage while Target Lock is active.
COV	Cold Open	gain +20% Damage when below 50% heat.
	Duct Tape	have a 100% Chance to deal Critical Damage while Overheating.
	Smelter	have a +35% Fire Rate when over 50% Heat.
	Ventilator	have a 25% Chance to cost no Heat when fired.
Daedalus	Accelerator	gain +1% Fire Rate per each bullet fired, for up to a maximum 50 Stacks, which reset on Reload.
	Backup Plan	slowly regenerate reserve Ammo while equipped.
	Bullet Fabricator	on kill have a 40% Chance to refill your Magazines.
	Stockpiler	on reload gain up to +25% Damage based on the amount of spare Ammo for the currently equipped gun.
Hyperion	Bulwark	gain 100% Gun Shield Capacity.
	Shock Guard	trigger a shock nova when deployed, with an 8-second cooldown.
	Stabilizer	gain 40% accuracy.
	Stim Coverter	regenerate up to 10% Health when the Gun Shield is hit.
Jakobs	Bounce Pass	increase the number of possible Ricochets by 1.
	Leaper	gain a 40% Chance to Ricochet non-critical hits.
	Piercer	have a 20% Chance to grant a Critical Hit.
	Sequencer	grant consecutive Critical Hits 5% stacking Bonus Damage to a maximum of 8 stacks.
Maliwan	Mixologist	deal 10% Bonus Damage from the inactive mode's element.
	Primed Potency	have 100% Status Effect Chance on the first bullet after Reload.
	Synthesizer	have +25% Status Effect Damage.
	Transfuser	on kill spread their active Status Effect to up to three nearby targets.
Order	Ammo Generator	slowly refill from reserve Ammo while held.
	Free Charger	when firing from Maximum Charge have a 30% Chance to make the next shot's Charge Time and Ammo zero.
	Muzzle Break	gain +50% Accuracy and +50% Burst Fire Speed when firing from Maximum Charge.
	Power Shot	gain 30% Damage when firing from Maximum Charge.
Ripper	Freeloader	have a 30% Chance to instantly refill its Magazine when empty.
	Hard Charger	gain +25% Damage, but Charge Time is increased by 30%.
	High Roller	increase Gun Damage by +2% for each consecutive shot fired, for a Maximum 25 Stacks.
	Short Circuit	after reloading an empty magazine have a 30% Chance to increase the next Magazine Fire Rate +100%.
Tediore	Banger	use +50% Maximum Loaded Ammo when calculating Thrown Damage.
	Digi-Divider	have a 50% Chance to spawn an additional Projectile on Reload.
	Extend-A-friend	have +50% longer Lifetime for Thrown Turrets.
	Recycler	keep 50% of a Magazine's Ammo on Reload.
Torgue	Air Burst	fire projectiles that explode on proximity.
	Boompuppy	on kill have a 50% chance to call down a Missile Barrage on a nearby enemy.
	Explosi-ception	have Sticky Magazines deal +50% Gun Damage on impact.
	Head Ringer	gain +25% damage and +100% Damage Radius.
Vladof	Bottom Feeder	reduce Underbarrel Cooldown Duration by 40%.
	Box Magazine	gain +20% Fire Rate and +20% Magazine Size.
	Bullet Hose	have a 30% Chance to add an extra Projectile per shot.
	Underdog	gain +50% Underbarrel Damage.

Manufacturer Enhancements by Weapon-Part Bonus[]

Atlas
	Protractor	Sure Shot	Tracker Antenna	Trauma Bond
Protractor	Y-Cartridge	Y-Initiator	Y-Z Nexus	X-Y Combo
Sure Shot	Y-Initiator	Initiator	Z-Initiator	X-Initiator
Tracker Antenna	Y-Z Nexus	Z-Initiator	Z-Intercept	Z-X Junction
Trauma Bond	X-Y Combo	X-Initiator	Z-X Junction	X-Terminal

COV
	Cold Open	Duct Tape	Smelter	Ventilator
Cold Open	Breezer	n/a	n/a	Glacier
Duct Tape	n/a	Ramshackler	Quicksilver	n/a
Smelter	n/a	Quicksilver	Rapid Fire	n/a
Ventilator	Glacier	n/a	n/a	Hole Punch

Daedalus
	Accelerator	Backup Plan	Bullet Fabricator	Stockpiler
Accelerator	Uptick	Accumulator	Scion	Gatherer
Backup Plan	Accumulator	Stockpiler	Steward	Collector
Bullet Fabricator	Scion	Steward	Inheritor	Hephaestian
Stockpiler	Gatherer	Collector	Hephaestian	Hoarder

Hyperion
	Bulwark	Shock Guard	Stabilizer	Stim Converter
Bulwark	Vanguard	Trooper	Besieger	Champion
Shock Guard	Trooper	Volt Action	Director	Principal
Stabilizer	Besieger	Director	Confidant	Stalwart
Stim Converter	Champion	Principal	Stalwart	Insurance

Jakobs
	Bounce Pass	Leaper	Piercer	Sequencer
Bounce Pass	Trick Shot	Blind Box	Quintain	Hat Trick
Leaper	Blind Box	Sampler	Ladykiller	Scattershot
Piercer	Quintain	Ladykiller	Widowmaker	Multistrike
Sequencer	Hat Trick	Scattershot	Multistrike	Hawkeye

Maliwan
	Mixologist	Primed Potency	Synthesizer	Transfuser
Mixologist	Houndstooth	Assuit	Lamé	Toile
Primed Potency	Assuit	Premiere	Maestro	Icon
Synthesizer	Lamé	Maestro	Haute Shot	Fashionista
Transfuser	Toile	Icon	Fashionista	Trendsetter

Order
	Ammo Generator	Free Charger	Muzzle Break	Power Shot
Ammo Generator	Eternity	Looper	Parallaxis	Ouroboros
Free Charger	Looper	Leap Year	Entangler	Primadiem
Muzzle Break	Parallaxis	Entangler	Celeritas	Evolver
Power Shot	Ouroboros	Primadiem	Evolver	Genesis

Ripper
	Freeloader	Hard Charger	High Roller	Short Circuit
Freeloader	Autophage	Entropic	Disruptor	Autocannibal
Hard Charger	Entropic	Sledge	Slugger	Devourer
High Roller	Disruptor	Slugger	Slammer	Binger
Short Circuit	Autocannibal	Devourer	Binger	Glutton

Tediore
	Banger	Digi-Divider	Extend-A-Friend	Recycler
Banger	100% Real Juice	Hydrator	Gummy	Quencher
Digi-Divider	Hydrator	Family Pack	Extension	Valuepalooza
Extend-A-Friend	Gummy	Extension	Social Integration	Value-Add
Recycler	Quencher	Valuepalooza	Value-Add	Value Mag

Torgue
	Air Burst	Boompuppy	Exlosi-ception	Head Ringer
Air Burst	Premature Detonator	Flashpan	Jackhammer	Pumper
Boompuppy	Flashpan	Bang Ganger	Body Counter	Big Banger
Exlosi-ception	Jackhammer	Body Counter	Cherry Popper	Studfinder
Head Ringer	Pumper	Big Banger	Studfinder	Pounder

Vladof
	Bottom Feeder	Box Magazine	Bullet Hose	Underdog
Bottom Feeder	Grassroots Movement	n/a	n/a	Dog Movement
Box Magazine	n/a	Hero of Labor	Hero of Bullet	n/a
Bullet Hose	n/a	Hero of Bullet	Lead Curtain	n/a
Underdog	Dog Movement	n/a	n/a	Dog of War