Best Legendary Assault Rifles in Borderlands 4 – Complete Farming Guide & Locations

Why Assault Rifles Dominate in Borderlands 4

Assault rifles are the backbone of any Vault Hunter’s arsenal—versatile enough for any situation, powerful enough to handle endgame content, and satisfying enough to make every fight feel epic. While Borderlands 4 is packed with legendary weapons across every category, legendary ARs offer something special: they bridge the gap between raw damage output and practical usability.

Thanks to the game’s procedural generation system with licensed parts and varying stats, no two legendary drops are exactly identical. But some legendary assault rifles stand head and shoulders above the rest, offering unique perks, devastating damage, or game-changing mechanics that make them worth farming repeatedly.

We’ve compiled the absolute best legendary assault rifles you should be hunting, where to find them, and what makes each one worth the grind.

1. Aegon’s Dream – The Ice and Fire Beast

How to Farm Aegon’s Dream

Boss: Horace
Location: Horace’s Oversight, Hungering Plain, Fadefields
Unlock Requirement: Complete “Down and Outbound” (Main Mission)

Special Perk: Prophetic

Alternating elemental damage – Incendiary and Cryo shots

Why It’s Amazing

Aegon’s Dream is the Game of Thrones Easter egg weapon you didn’t know you needed. This Vladof legendary doesn’t just reference “A Song of Ice and Fire”—it becomes one. The alternating shot pattern is brilliantly simple yet devastating:

Shot 1: Incendiary (Fire) damage
Shot 2: Cryo (Freeze) damage
Shot 3: Incendiary
Shot 4: Cryo
…and so on

Why this matters: Enemies are simultaneously frozen and burning, creating constant elemental procs. The freeze effect slows or immobilizes targets while the fire DOT chips away at their health. It’s crowd control and damage in one beautiful package.

Best for:

• Elemental-focused builds (especially Cryo + Incendiary skill trees)
• Handling large groups of enemies
• Players who enjoy status effect chaos
• Boss fights where you need sustained damage

Build synergy tip: If you’re running Amon with Cryo specialization or Vex with elemental amplification skills, this weapon becomes absolutely monstrous. Stack elemental damage bonuses and watch health bars evaporate.

The high magazine capacity and solid fire rate mean you’re rarely reloading, and you’re always applying dual elemental effects. As Gatling guns go, this one sings a deadly song.

2. G.M.R. – The Precision Powerhouse

How to Farm G.M.R.

Boss: Driller Hole
Location: Queen’s Cradle, Tonnage Peel, Carcadia Burn
Unlock Requirement: Complete “Unpaid Tab” (Main Mission)

Special Perk: Big Name Hunter

When Zoomed: +100% Damage, +100% Shot Cost, -50% Fire Rate

Why It’s Amazing

The G.M.R. is an identity crisis done right—it’s technically an assault rifle but plays like a precision rifle (basically a hybrid AR/Sniper). When you zoom in, you’re making a conscious trade-off: double damage per shot, but you’re burning twice the ammo and firing half as fast.

The math works out beautifully:

• Normal: 100 damage per shot, 10 shots/second = 1,000 DPS
• Zoomed: 200 damage per shot, 5 shots/second = 1,000 DPS… BUT higher accuracy means more crits

Reality check: The increased stability and accuracy when zoomed means you’re landing critical hits far more consistently. Those crits push your actual DPS significantly higher than the math suggests.

Best for:

• Mid-range combat specialists
• Players with good aim who want to be rewarded
• Situations where you can’t get close enough for SMGs but don’t want sniper-level distance
• Boss fights with exploitable crit spots

Playstyle tip: Don’t hold the trigger. Fire in controlled bursts while zoomed, aim for weak points, and you’ll delete enemies with shocking efficiency. This isn’t a run-and-gun weapon—it rewards patience and precision.

Not recommended for: Close-quarters chaos or hyper-mobile enemies. The reduced fire rate can feel sluggish against fast-moving targets.

3. Lumberjack – The Ricochet Ripper

How to Farm Lumberjack

Boss: The Pitted Stain
Location: Ripper Drill Site, Idolator’s Noose, Fadefields
Unlock Requirement: Accessible after reaching Fadefields region

Special Perk: Timber

Fires saw blades that ricochet and apply damage-over-time

Why It’s Amazing

Forget bullets—you’re throwing spinning saw blades that bounce around like death frisbees. Each projectile deals initial impact damage, then continues cutting into enemies with persistent DOT (damage over time).

The ricochet mechanic is brilliant: Miss your initial target? The saw blade bounces off walls, floors, and ceilings, potentially hitting enemies you didn’t even see. It’s like having homing ammunition without the actual homing.

Damage breakdown:

1. Impact damage – Initial hit when the saw blade connects
2. Bleed DOT – Continuous cutting damage over several seconds
3. Ricochet potential – Can hit multiple targets or the same target multiple times

Best for:

• Enclosed spaces where ricochets are guaranteed
• Sadistic players who love watching enemies bleed out
• DOT-focused builds
• Situations with clustered enemies

Pro tip: Fire into tight corridors or small rooms and watch the chaos unfold. The saw blades turn confined spaces into meat grinders.

Visual satisfaction level: 10/10. Seeing spinning saw blades bouncing around while enemies stumble and bleed is pure Borderlands joy.

4. Oscar Mike – The Space Laser Monster

How to Farm Oscar Mike

Boss: Genone
Location: The Yawning Yard, Lopside, Carcadia Burn
Unlock Requirement: Complete “Fault Finding” (Side Mission)

Special Perks:

Space Laser – Alt-Fire calls down an orbital laser (0.2s tick rate, 60s cooldown)
Tactical Rounds – First half of magazine deals +50% bonus damage

Why It’s Absolutely Broken

Let’s be honest: you want this gun purely for the “SICK-ASS SPACE LASERS” mentioned in the red flavor text. And you should. The alt-fire is essentially a free action skill that calls down an orbital strike dealing massive damage every 0.2 seconds in a small AOE.

The space laser is ridiculous:

• Damage scales with your gun damage buffs and skill bonuses
• 60-second cooldown means you’re using it constantly
• Small AOE lets you hit bosses and nearby adds simultaneously
• At high levels with proper builds, this is basically a tactical nuke

But wait, there’s more: The base gun itself is excellent. Tactical Rounds gives you +50% damage on the first half of every magazine, incentivizing mag dumps and rewarding aggressive play.

Best for:

• Literally everyone. This gun is universally good.
• Gun damage-focused builds (the scaling is absurd)
• Boss melting
• Players who want to feel like orbital support is on speed dial

Build synergy: Stack gun damage percentage increases and Action Skill cooldown reduction. The space laser scales off gun damage, so every buff you apply makes it stronger. At endgame with optimized builds, the alt-fire can one-shot entire enemy groups.

Full-auto mode: Even without the space laser, Oscar Mike maintains solid DPS with good fire rate and hard-hitting bullets. This is a complete package.

If you only farm ONE legendary AR from this list, make it Oscar Mike. It’s that good.

5. Lucian’s Flank – The Infinite Ammo Dream

How to Farm Lucian’s Flank

Boss: The Meathead Riders
Location: The Old Scrape (Ripper Drill Site), Cuspid Climb, Terminus Range
Unlock Requirement: Accessible after reaching Terminus Range

Special Perk: Trample

Critical hits refill up to 2 ammo per shot

Why It’s Amazing

Lucian’s Flank is a Vladof masterpiece that rewards skilled players with what’s essentially infinite ammunition. Land critical hits, and you’re refilling 2 rounds per shot into your magazine. With good aim, you can fire indefinitely without ever reloading.

The dream scenario:

1. Get close to a boss with a large crit spot
2. Aim at the weak point
3. Hold down the trigger
4. Watch the magazine stay full while the boss’s health disappears

The reality: You need consistent accuracy to maintain the infinite loop. Miss crits, and you’re reloading like a peasant. Hit crits, and you’re a DPS god.

Build considerations:

• High magazine capacity variants are essential
• Critical hit damage bonuses multiply your effectiveness
• Extra Barrel variants (secondary barrel with increased fire rate) are god-tier rolls

Best for:

• Players with good aim and reflexes
• Close to mid-range combat
• Bosses with exploitable crit zones
• Builds focusing on critical hit damage

Caution: This is an ammo-guzzler despite the refill mechanic. When you’re not hitting crits, you’re burning through reserves fast. Carry plenty of AR ammo SDU upgrades.

Vladof lovers rejoice: This is proof that Vladof doesn’t just make bullet hoses—they make intelligent bullet hoses that reward skill.

6. Star Helix – The Auto-Aim Wonder

How to Farm Star Helix

Boss: The Timekeeper
Location: Upper Dominion, Terminus District, Dominion
Unlock Requirement: Complete “The Timekeeper’s Order” (Main Mission)

Special Perk: Constellation

Projectiles can fire vertically or horizontally with auto-aim seeking

Why It’s Interesting

Star Helix isn’t the highest DPS option on this list, and it’s not the hardest-hitting, but it has one killer feature: you barely need to aim. The Constellation perk lets you toggle projectile patterns (vertical or horizontal spread), and those projectiles automatically seek the nearest target.

How it works:

• Fire in the general direction of enemies
• Bullets adjust trajectory mid-flight to home in on targets
• Aim vaguely at the head, and all projectiles converge for crit damage
• Projectiles pierce through targets, hitting multiple enemies

Best for:

• Casual players who prioritize fun over optimization
• Situations with overwhelming enemy numbers
• Players with mobility-focused builds who can’t aim precisely while jumping/sliding
• “Spray and pray” enthusiasts who want actual results

Element variety: Can drop with Corrosive, Shock, Fire, or Cryo, making it versatile against different enemy types.

Honest assessment: It’s not a top-tier meta weapon, but the auto-aim gimmick makes it incredibly fun and surprisingly effective in chaotic fights. Sometimes you just want to shoot and let the gun do the work.

If you enjoyed the Pokemon-inspired mechanics in the Wayward Gun quest, you’ll appreciate Star Helix’s forgiving aiming system.

7. Whiskey Foxtrot – The Minigun Madness

How to Farm Whiskey Foxtrot

Boss: Directive-O
Location: Ironwall Resolve (Order Bunker), Terminus District, Dominion
Unlock Requirement: Complete “One Gassy Issue” (Side Mission)

Special Perk: Overdrive

Switches to secondary magazine for full-auto firing

Why It’s Amazing (With the Right Roll)

Whiskey Foxtrot is build-dependent, but when the stars align, it’s a boss-deletion machine. The key is getting a Ripper-Licensed Magazine variant, which requires charging before firing but transforms the barrel into a minigun with catastrophic fire rate.

The setup:

1. Get Ripper-Licensed Magazine variant (RNG drop)
2. Charge the weapon (hold trigger briefly)
3. Unleash absolute bullet hell
4. Deplete entire magazine in seconds

Game-changer combo: If you’re lucky enough to get the Legendary Slugger Enhancement (randomly dropped legendary gear that buffs Ripper-Licensed weapons), Whiskey Foxtrot becomes genuinely absurd:

• Massive damage increase
• Even higher fire rate
• Complete ammo depletion in ~3 seconds
• Boss health bars vanish before your eyes

Best for:

• Fire rate-focused builds
• Players who’ve found Slugger Enhancement
• Boss farming (when you need to end fights FAST)
• Amon Forgeknight builds with fire rate bonuses

Reality check: Without the right variant and gear synergy, Whiskey Foxtrot is just decent. With them, it’s monstrous. This is high-investment, high-reward territory.

Ammo warning: You will burn through assault rifle ammunition at terrifying speeds. Max out those SDUs.

8. Wombo Combo – The Rocket-Fueled Shredder

How to Farm Wombo Combo

Boss: Rippa Roadbirds
Location: Saw’s Clench (Ripper Drill Site), Ruined Sumplands, Carcadia Burn
Unlock Requirement: Accessible after reaching Carcadia Burn

Special Perk: Rip Rockets

Automatically fires rockets from underbarrel while shooting

Why It’s Amazing

Wombo Combo is the “more is more” philosophy weaponized. You’re not just firing bullets—you’re simultaneously launching rockets from an underbarrel attachment. Hold the trigger, and watch as your DPS climbs higher the longer you fire.

What you’re actually doing:

• Primary: Vladof high fire-rate bullets
• Secondary: Random rocket launches from underbarrel
• Combined: Shredding through everything in front of you

The fire rate ramp-up: Like most Vladof weapons, Wombo Combo fires faster the longer you hold the trigger. Start slow, end with a bullet hurricane.

Why rockets matter: Each rocket adds substantial burst damage on top of your sustained bullet stream. They’re not manually aimed—they just fire automatically while you’re shooting, adding free explosive damage.

Best for:

• Fire rate-stacking builds
• Elemental damage enthusiasts (bullets + explosive rockets)
• Players who want maximum screen chaos
• Situations where you need to kill everything in a general direction

Build synergy: Any skill that increases fire rate makes Wombo Combo progressively more ridiculous. Pair with Vladof-specific bonuses or general AR buffs for maximum carnage.

Ammo consumption: Extreme. You’re firing bullets AND rockets. Your ammo reserves will cry, but your enemies will cry harder.

Fun factor: Off the charts. There’s something deeply satisfying about holding down the trigger and watching explosions mix with bullet trails while enemy health bars just… disappear.

Quick Reference: Best AR for Your Build

Not sure which legendary to farm first? Here’s a quick guide:

For Elemental Builds: → Aegon’s Dream (dual elements) or Wombo Combo (rockets + element)

For Precision Players: → G.M.R. (crit-focused hybrid) or Lucian’s Flank (infinite ammo crits)

For Raw DPS: → Oscar Mike (space lasers + tactical rounds) or Whiskey Foxtrot (minigun mode)

For Fun/Casual Play: → Star Helix (auto-aim) or Lumberjack (ricochet saw blades)

For Boss Melting: → Oscar Mike (space laser nukes) hands down

General Farming Tips

Increasing Your Legendary Drop Rates

1. Farm at Your Level Legendary drops scale to your current level. Farm when you’ve hit level caps for maximum effectiveness.

2. Use Moxxi’s Big Encore After defeating a boss once, use the respawn machine (costs 25,000 currency) to farm repeatedly without replaying missions.

3. Increase Loot Luck

• Complete Vault Symbol challenges
• Equip Loot Luck-boosting gear
• Use Lucky Dice collectibles (if available in area)

4. Know Your Anointments Legendary variants can roll with different:

• Elements (Fire, Shock, Corrosive, Cryo, Radiation)
• Licensed parts (Vladof, Dahl, Maliwan, etc.)
• Magazine sizes
• Special attachments (scopes, stocks, grips)

Don’t settle for the first drop. Farm for the perfect roll.

Best Characters for AR Builds

Rafa (Exo-Class Soldier):

• Gun damage bonuses
• Fire rate increases
• Reload speed buffs
• Perfect for Vladof ARs

Amon (Forgeknight):

• Elemental damage amplification
• Weapon swap buffs
• Great with Aegon’s Dream

Vex (Siren):

• Elemental synergies
• Status effect duration
• Pairs beautifully with Aegon’s Dream

For more build optimization strategies, check out our legendary class mods farming guide.

The Verdict: Which AR Should You Farm First?

If you’re only going to farm one legendary AR, make it Oscar Mike. The space laser alt-fire is genuinely game-changing, the base weapon is excellent, and it works with virtually any build. It’s the Swiss Army knife of legendary assault rifles.

Second priority: Aegon’s Dream for elemental builds or Wombo Combo for raw DPS enthusiasts.

For fun factor: Lumberjack (ricochet saw blades) and Star Helix (auto-aim) offer unique gameplay experiences.

For skilled players: Lucian’s Flank and G.M.R. reward precision with incredible performance.

Final Thoughts

Legendary assault rifles in Borderlands 4 prove that the game respects player diversity. Whether you want orbital lasers, infinite ammo loops, saw blade ricochets, or minigun madness, there’s a legendary AR that matches your playstyle.

The beauty of Borderlands’ loot system is that you can farm these weapons at any point in your journey. Early-game? Farm what’s available. Endgame? Go back and grab everything for your collection. The procedural generation ensures every farm run feels rewarding.

Now get out there, find those boss locations, and start building your legendary arsenal. Those Vault Monsters won’t shoot themselves.

Get Borderlands 4:

• Official Website
• Steam Store
• PlayStation Store

Related Farming Guides:

• Pokemon Easter Egg Quest Guide
• All Legendary Drop Locations
• Best Legendary SMGs Guide
• Best Legendary Shotguns Guide
• Best Legendary Shields Guide
• Legendary Class Mods Farming
• Complete Endgame Guide