Borderlands 4 fixes the Songbird stacking exploit (Oct 23 update)
Borderlands 4The Day 30 patch stops San Saba Songbird’s infinite swap stacking and tightens several weapon interactions across the board.
The October 23 “Day 30” update targets a long-running exploit tied to the Jakobs Legendary Pistol San Saba Songbird. The patch changes how the pistol handles weapon swapping so it no longer builds damage or effect stacks indefinitely when you flip away and back. If you were relying on rapid swaps to ramp the Songbird beyond its intended output, that behavior is now shut down.
What changed for San Saba Songbird
The update explicitly disables infinite stacking from weapon swapping on San Saba Songbird. In practice, repeated swaps should no longer escalate damage or on-hit effects beyond the weapon’s normal behavior. You can still use the pistol’s intended synergies; the fix only removes the runaway stacking loop created by swap timing.

How the old stacking behaved, and what to expect now
Before this patch, quick swapping off the Songbird and immediately back could accumulate unintended stacks, pushing damage far past balance targets. Post-update, swap timing won’t create those extra layers. Expect a flatter damage curve: consistent shot-to-shot performance without sudden spikes from swap macros or manual “double taps.”
How to verify the fix on your system
- Update the game to the latest build available on your platform.
- Equip San Saba Songbird and a second weapon in adjacent slots.
- Fire several shots to establish baseline damage, swap to the other weapon, then swap back and repeat.
- Watch for escalating damage. If the exploit is fixed on your build, values won’t climb solely from swapping.

Related weapon and grenade fixes in the same patch
This update also addresses other edge-case interactions that could spike damage, bypass armor types, or misfire ricochets and underbarrel effects.
| Item or system | Change |
|---|---|
| Jakobs Legendary Pistol “San Saba Songbird” | No longer stacks infinitely when swapping weapons. |
| Jakobs Shotgun + Torgue sticky + Knife Launcher underbarrel | No knife damage carries over after switching fire modes. |
| Jakobs weapon parts (ricochet behavior) | Ricochets now only trigger from intended damage sources. |
| Ripper Legendary Shotgun “Golden God” | Overheating now clears correctly when switching weapons. |
| Maliwan Legendary SMG “Ohm I Got” | First three shots no longer consume ammo without dealing damage during continuous fire. |
| Maliwan Legendary Heavy “Gamma Void” | Applies the proper increased Radiation damage to enemies inside the Singularity. |
| Weapons with COV magazines (multiplayer) | Function correctly if a repair animation is interrupted with a Repkit. |
| Daedalus Legendary SMG “Frangible” | Removed from chest loot tables. |
| Daedalus Legendary AR “First Impression” | Reduced critical damage multiplier. |
| Order ARs and Torgue Heavy (Triple Barrel parts) | Improved recoil behavior while charging and firing with Gun Handling passives. |
| Vladof Flamethrower underbarrel | No longer deals infinite damage or bypasses Bio Armor. |
| Torgue Grenades (Spring + Apex augments) | Now always explode on the first apex. |
| Grenades (Spring augment + Divider payload) | Now have the intended three additional bounces when paired. |
| Gadgets (Second Wind) | No longer reset to maximum uses after gaining Second Wind. |
Seasonal context: Horrors of Kairos event timing and drops
The patch launches alongside the limited-time Horrors of Kairos event, running from October 23 to November 6. During world boss encounters, the event adds a blood rain effect and introduces two event-specific legendary drops: the Murmur Tediore Assault Rifle and the Skully Order Grenade. These drops are delivered to the Reward Center and do not alter other boss drop rates.
Impact on builds and what to do next
If your build leaned on the Songbird’s swap stacking, plan for normalized damage output in bossing and mobbing. The pistol remains usable within intended parameters, but it won’t carry swap-driven spikes. Consider leaning more on class skill synergies, critical hit uptime, and elemental matchups while you revisit gear. The broader set of fixes also curbs other unintended interactions—especially ricochet abuse, underbarrel overperformance, and grenade timing—so expect a more predictable endgame across co-op and solo play.
For now, the key takeaway is simple: the San Saba Songbird’s infinite swap stacking is disabled in the Day 30 build. If you still see behavior that looks like stacking, recheck your game version, eliminate overlapping buffs in testing, and restart before drawing conclusions.
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