Borderlands 4 Parts, Traits, Licensed Parts & Underbarrel Attachments

This page is a detailed guide on how generic, manufacturer-specific, and licensed parts are combined in Borderlands 4 to create the large variety of procedurally generated weapons and gear that are the series's trademark.

Overview[]

In Borderlands 4, "parts" describes anything that modifies how a weapon or piece of gear functions. Certain types of parts are generic and others are manufacturer-specific, and both types can grant special effects to the equipment they're a part of.

Part types[]

There are 5 types of Part in Borderlands 4:

Traits: Manufacturer-specific parts; Default unique effect for certain Weapons and Gear.
Generic: Non-manufacturer-specific parts; Appear on Ordnance and Gear only.
Licensed Parts: Manufacturer-specific parts; Appear on Guns only.
Underbarrel Attachments: Manufacturer-specific parts; Appear on Guns only.
Legendary parts: For legendary items only.

Cheat Sheet[]

Part Type	Description	This part type has manufacturer-named parts?	This part type has non-manufacturer-named parts?	Appear in Weapons?	Appear in Gear?
Traits	Default manufacturer-unique-effect.	yes	no	yes	yes
Generic	No manufacturer-unique-effect.	no	yes	Ordnance only	yes
Licensed Parts	Manufacturer-unique-effect that can appear on any gun.	yes	no	Guns only	no
Underbarrel Attachments	Or [Alt-Fire]. Alternative function for a gun.	yes	yes	Guns only	no
Legendary	For legendary items only.	no	no	yes	yes

Slots & Rarity[]

All items can have up to 3 slots for parts, depending on item type and rarity.
If a weapon or grenade shows 4 slots, the 4th one is its default trait (not a part slot).
Legendary parts take up 1 slot; legendary quality does not add capacity.
Higher rarity does not necessarily mean all part slots will be filled. The number of parts possible is simply the maximum.

Guns can have up to 3 slots for Licensed Parts or Underbarrel Attachments, depending on their rarity.

Rarity	Max. # of Parts
Common	0
Uncommon	1
Rare	2
Epic	3
Legendary	2 + 1 Legendary part

Note that the above table is for guns only. The relationship between rarity and parts works differently for ordnance, shields, and repkits.

Examples[]

Gun Trait[]

Gun traits are unique Parts of a manufacturer that are always available to their weapons along with their additional traits.

Traits[]

Manufacturer	Main trait		Additional traits
Atlas	Not available		N/A
CoV
Hyperion
Daedalus	Always has an underbarrel attachment.		Mostly burst fire. Can be semi and full-auto. Secondary fire alters stats by ammo type. Can be elemental.
Daedalus		Secondary fire consumes [different type of ammo]
Jakobs		Critical hits will ricochet projectiles to nearby enemies	Always semi-auto.
Maliwan	Always elemental. Always has an underbarrel attachment.		Can be semi and full-auto. Always deal splash damage, very small area.
Maliwan		Underbarrel — Can switch between X and X Elements [where X's are pair of Incendiary, Shock, Corrosive, Cryo, Radiation]
Order		Can charge up to fire multiple rounds at once	Always semi-auto.
Ripper		This Gun charges before Full Auto firing	Always full-auto (conditional). Can be elemental.
Tediore	Reload by throwing the gun.		Can be semi and full-auto.
				Combo — Thrown Gun can be shot to increase the explosion's Damage
				Combo Homing — Thrown Gun homes in and can be shot to increase the explosion's Damage
				Combo Javelin — Thrown Gun is propelled forward and can be shot to increase the explosion's Damage
				Combo Legs — Thrown Gun has legs and can be shot to increase the explosion's Damage
				Combo Replicator Javelin - Throws 2 Guns that propel forward and can be shot to increase the explosion's Damage
				MIRV — Thrown Gun spawns 4 Grenades on impact
				MIRV Homing — Thrown Gun homes in and spawns 4 Grenades on impact
				MIRV Javelin — Thrown Gun is propelled forward and spawns 4 Grenades on impact
				MIRV Legs — Thrown Gun has legs and spawns 4 Grenades on impact
				MIRV Replicator — Throws 2 Guns that spawn 4 Grenades on impact
				Replicator — Throws additional Gun on Reload
				Replicator Javelin — Throws 2 Guns that propelled forward at high speed
				Replicator Homing — Throws 2 Guns that home in
				Replicator Legs — Throws 2 Guns with legs that run toward enemies
				Shooting Javelin — Thrown Gun is propelled forward and shoots enemies
				Shooting Legs — Thrown Gun has legs and shoots enemies
				Shooting Replicator Legs - Throws 2 Guns with legs that shoot enemies until out of Ammo
Torgue		Secondary fire shoots sticky Gyrojets that explode on Reload or when switching Modes - which increases explosion Damage by +X% each	Always semi-auto. Always deal splash damage, medium-large area.
Vladof	Always has an underbarrel attachment.		Always full-auto (unconditional).^[1]

Licensed Parts[]

Licensed parts allow guns not made by a manufacturer to share that manufacturer's unique traits.

Parts[]

Manufacturer prefixes (e.g: Atlas-Licensed...) have been removed from licensed part names for the sake of visual clarity.

Manufacturer	Icon	Description
Atlas		[Alt-Fire] Underbarrel — Fires Tracker Darts, tagging enemies that your Projectiles will home in on for 10s
Atlas		[Alt-Fire] Underbarrel — Fires Tracker Grenades, tagging enemies that your Projectiles will home in on for 8s
CoV		Magazine — This Gun has an unlimited Magazine size, however it will heat up, and eventually break (fixing the gun is CoV's reload mechanism).
Daedalus		(Alt-Fire) Multi-Loader — Secondary fire consumes [different type of ammo, whichever the main gun is not using]
Hyperion		Grip — Accuracy increases with continuous fire
		Shield — Zoom to enable Gun Shields
		Amp Shield — Damage to Gun Shields amplifies Gun Damage
		Absorb Shield — Damage to Gun Shields absorbs Ammo
		Ricochet Shield — Damage to Gun Shields can Ricochet back toward enemies
Jakobs		Accessory — Critical Hits will Ricochet Projectiles to nearby enemies
Maliwan		Underbarrel — Can switch between X and X elements [whereas X's are pair of Incendiary, Shock, Corrosive, Cryo, Radiation]
Order	N/A
Ripper		Magazine — This Gun charges before Full Auto firing
Ripper		Magazine — This Gun charges before Full Auto firing, overriding the Order manufacturer's Charge functionality [if base gun manufacturer is Order]
Tediore		Accessory — Throws a Gun on Reload
		Accessory - Combo — Thrown Gun can be shot to increase the explosion's Damage
		Accessory - Combo Homing — Thrown Gun homes in and can be shot to increase the explosion's Damage
		Accessory - Combo Javelin — Thrown Gun is propelled forward and can be shot to increase the explosion's Damage
		Accessory - Homing — Thrown Gun homes in on nearby enemies before exploding
		Accessory - Javelin — Thrown Gun is propelled forward
		Accessory - Legs — Thrown Gun has legs and runs toward enemies
		Accessory - Shooting — Thrown Gun will shoot at enemies until it's out of ammo
		Accessory - Shooting Javelin — Thrown Gun is propelled forward and shoots enemies until out of ammo
Torgue		Impact Magazine — Fires Gyrojets that explode on impact
Torgue		Sticky Magazine — Fires sticky Gyrojets that explode on Reload, or when switching Modes - which increases explosion Damage by +X% each (X amount is based on gun type.)
Vladof	N/A^[1]

Underbarrel Attachment[]

Also known as Alt-Fire, underbarrel attachments allow guns that would not normally have alternative functions to utilize them.

Conflicts[]

Underbarrel attachments cannot appear on guns if their manufacturers differ (e.g, Jakobs underbarrel attachments can't appear on Tediore guns and vice versa).
- The only exceptions are manufacturer-specific parts that have a Licensed Part as its prefix: Atlas, Daedalus & Maliwan.
Maliwan guns may spawn with different attachments, disabling their element-switching function.

Attachments[]

All underbarrel attachments that have "Alt-Fire" as its prefix have been removed for sake of visual clarity.
X depends on the player character's skills, weapon's level, parts, and bonus stats from Enhancement, Class Mod, or Firmware.

Manufacturer	Icon	Name	Effects	Regen Rate
Manufacturer	Icon	Name	Effects	Ammo	Sec.
Atlas		Underbarrel [Licensed Part]	Fires Tracker Darts, tagging enemies that your Projectiles will home in on for 10s	N/A
Atlas		Underbarrel [Licensed Part]	Fires Tracker Grenades, tagging enemies that your Projectiles will home in on for 8s	N/A
Daedalus		Demolition Charge	Fires timed explosives, each dealing X×3 Damage	3	40
		Gravity Harpoon	Fires a Gravity Harpoon that deals X Damage	1	24
		Grenade Launcher	Launches a Grenade that deals X Damage per shot	3	20
		Micro-Rocket POD	Fires a Rocket, dealing X Damage per shot	15	24
		Multi-Loader [Licensed Part]	Secondary fire consumes [different type of ammo, whichever the main gun is not using]	N/A
		Overcharge	Increases Burst Count to 6 and Fire Rate to 12/18/25	N/A
		Tactical Knife Launcher	Fires a Knife that deals X Damage per shot	8	30
		Taser	Fires a Taser Dart that deals X Damage/s to a nearby enemy	1	20
Jakobs		Crank SMG	Crank-fires a SMG that deals X Damage per shot	24	24
		Double Flintlocks	Fires twin Musket Barrels that deal X×2 Damage	1	15
		Gravity Harpoon	Fires a Gravity Harpoon that deals X Damage and pulls in nearby enemies	1	32
		Knife Launcher	Launches a Knife that deals X Damage	1	30
		Spread Launcher	Fires a spread of Grenades that deal X×5 Damage each	1	24
		Underbarrel Shotgun	Fires a Shotgun that deal X×9 Damage per shot	5	15
		Vial Launcher	Launches a Corrosive Vial that deals X Corrosive Damage on impact and increases the target's Damage Taken by +30% for 6s	4	20
		Zip Rockets	Fires Zip Rockets that deal X Damage each	5	10
Maliwan		Beam Tosser	Launches a Projectile that fires 3 Beams that deal X Damage each	3	26
		Energy Blast	Charge-fires a wide-angled Blast that deals X Damage	1	16
		Energy Disc	Launches a bouncing Energy Disc that deals X Damage per bounce	2	20
		Energy Discharge	Charge-fires a Blast that deals X Damage	1	16
		Laser Wire	Spawns a Laser Wire that deals X Damage/s	4	24
		Railgun	Charge-fires a piercing Railgun shot that deals Damage	2	20
		Rocket Pod	Fires a salvo of Homing Rockets that deal X×4 Damage	16	16
		Shock Field	On impact, creates a Shock Field that deals X Damage/s	2	20
		Singularity Grenade Launcher	Fires a Singularity that deals X Damage/s	1	40
		Underbarrel [Licensed Part]	Can switch between X and X elements [where X's are pair of Incendiary, Shock, Corrosive, Cryo, Radiation]	N/A
Order		Death Sphere	Launches a Death Sphere that deals X Damage/s to nearby enemies	1	30
		Energy Burst	Charge-fires an Energy Burst, that deals up to X Damage to nearby enemies	1	24
		Kill Drone	Launches a Drone that fires at enemies for X Damage per shot, before exploding for X Damage	1	40
		Micro-Rockets	Charge-fires up to 6 Micro-Rockets that deal X Damage each	6	20
		Ordonite Spike	Launches a Spike that drains power from nearby enemies before exploding for up to X Damage	2	36
		Seeker Missiles	Charge to fire up to 4 Seeker Missiles each dealing X Damage	4	24
Ripper		Fuel Rod Discharge	Fires a spent Fuel Rod that explodes after 3s and deals X Radiation Damage	1	36
		Gas Trap	Fires a Projectile that explodes, causing a cloud of Noxious Gas that deals X Corrosive Damage to enemies over time	3	21
		Gauss Gun	Charge-fires a Projectile that deals X Damage	4	16
		Gravity Trap	Fires a Singularity that deals X Damage, and pulls in nearby enemies	1	36
		Lightning Beam	Fires a Beam that deals X Shock Damage/s and can chain to an additional target	20	30
		Ripper Rocket Launcher	Launches bursts of 6 Rockets that deal X Damage	12	24
		Seeker Missiles	Fires Missiles that deal X Damage each	6	15
		Shrapnel Cannon	Fires shrapnel that deals X×8 Damage per shot	3	15
		Target Marker	Fires a Marker that deals X Damage, Marking the enemy to receive an additional +35% Damage for 8s	1	20
Tediore		Attack Drone	Launches a Drone that homes in on a nearby enemy, exploding for X Damage	1	30
		Deployable Barrier	Deploys a Shield that blocks incoming Projectiles	1	30
		Digital Backup	Deploys a Tediore Assault Rifle with legs that fires at enemies	1	24
		Micro-Shotgun	Fires a Shotgun that deals X×4 Damage per shot	3	12
		Proximity Mines	Fires Proximity Mines that deal X Damage each	2	36
		Support Drone	Launches a Support Drone that will Heal X/s and grants +20% Damage, Movement Speed and Reload Rate	1	30
		Zip Rockets	Fires Zip Rockets that deal X Damage each	6	24
Torgue		Airstrike	Mark an area to call in an Airstrike that deals X Damage	1	60
		Exhaust Blast	Releases a Blast on nearby enemies that deals X Damage	1	24
		Magnum Rockets	Fires a Rocket that deals X Damage	2	30
		MIRV Grenade Launcher	Launches a MIRV Grenade that deals X Damage	1	30
		Rolling Thunder Grenades	Fires Grenades that deal X Damage each	2	30
		Seeker Missiles	Launches Homing Missiles that deal X Damage each	2	20
		Sticky Shotgun	Fires a Sticky Shotgun that deal X×6 Damage per shot	3	20
		Turbine Cleaver	Fires a piercing Cleaver that deals X Damage	1	20
Vladof		Big Rocket	Fires a Rocket that deals X Damage on impact	1	30
		Bipod	Enabling the Bipod increases Accuracy by +75%, but decreases Movement Speed by -50%	N/A
		Motile Bipod	Enabling the Bipod increases Accuracy by +75%	N/A
		Extra Barrel	Enables a Secondary Barrel/Third Barrel, increasing Fire Rate	N/A
		Flamethrower	Fires a Flamethrower that deals X Incendiary Damage/s	64	16
		Grenade Launcher	Launches a Grenade that deals X Damage per shot	3	20
		Shotgun	Fires a Shotgun that deals X×6 Damage per shot	8	14
		Taser	Fires a Taser that damages a nearby enemy for X Shock Damage/s	3	22
		Zip Rockets	Fires Zip Rockets that deal X Damage each	36	24

Other Parts, Enhancement and Firmware[]

Notes[]

↑ ^1.0 ^1.1 This means you cannot gain Full-Auto on any other guns unless the the base gun is made by Vladof or is a specific Daedalus, Maliwan or Tediore model, or one of the gun's Licensed Parts is made by Ripper.

[:0-1] 1.0 ^1.1 This means you cannot gain Full-Auto on any other guns unless the the base gun is made by Vladof or is a specific Daedalus, Maliwan or Tediore model, or one of the gun's Licensed Parts is made by Ripper.

[1]