Air-Cooled Core is an origin trait in Destiny 2 that can appear on 6 weapons. There is also an enhanced version with a stronger effect.
What Air-Cooled Core does
Sprinting increases vent or reload speed for a short time. While at low heat or full magazine, gain increased handling and movement speed when aiming down sights.
Enhanced version
Sprinting increases vent or reload speed for a short time. While at low heat or full magazine, gain further increased handling and movement speed when aiming down sights.
