- "Reduces Sprint-to-Fire delay and increases stability, but decreases movement speed."
- — In-game description
The Thunderbolt Sling is a Signature Attachment for the HBRa3 in the Stock category, which was added as part of the Season 2: Task Force 141 update.
It decreases the sprint-to-fire, horizontal recoil, vertical recoil, at the cost of ADS movement speed and bullet spread.