Sundering is an origin trait in Destiny 2 that can appear on 4 weapons. There is also an enhanced version with a stronger effect.
What Sundering does
Destroying vehicles and constructs or breaking target shields grants this weapon bonus reload speed and charge rate. Constructs include barricades, turrets, Stasis crystals, and other objects created in the field.
Enhanced version
Destroying vehicles and constructs or breaking target shields grants this weapon additional bonus reload speed and charge rate. Constructs include barricades, turrets, Stasis crystals, and other objects created in the field.