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Borderlands 4 Guide

How to Unlock the Legendary Aching Roil SMG

Legendary Loot
Weapons
By Mobalytics
Updated on Nov 20, 2025
Nov 20, 2025

Overview

The Aching Roil is a Legendary Ripper SMG which is obtainable through the How Rush Saved Mercenary Day Vault Card.

Its unique effect prevents it from firing when it Overheats, but swapping gun modes reduces heat.

borderlands 4 aching roil SMG

How To Get

Unlock Location + Farm Method:

  • Acquire the How Rush Saved Mercenary Day Bounty Pack (this is free!)
  • Complete daily and weekly challenges for Vault Card Tickets
    • Daily Challenges provide 3-4 tickets, Weeklies provide 10
  • Exchange 10 tickets for a choice of Aching Roil, Extolled Rooker, Missilaser, or Hardpoint!
    • You may purchase these guns an unlimited number of times to roll different stats and attachments.

how rush saved mercenary day vault card


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