- "Extended barrel with polygonal rifling to improve bullet velocity and damage."
- — Gunsmith description
The Sigma Special barrel is a unique attachment available for the ZRG 20mm in Call of Duty: Black Ops Cold War. It gives increased damage and bullet velocity while decreasing rechamber time.
Effects[]
| Weapon | Length | Unlock Level | Stats |
|---|---|---|---|
| ZRG 20mm | 42.7" | Weapon Level 48 | + 33% Damage + 19% Bullet Velocity - 19% Fire Rate |