The HB-4 Projectile Rifle was a long-range projectile rifle produced by Prax Arms during the Galactic Civil War. Unique for allowing a trained marksman to virtually ensure a one-shot attack, the HB-4 fired special projectiles which trailed by a mono-filament trace-wire, allowing it to receive flight adjustment codes from the rifle. The marksman had to maintain line-of-sight (and a steady hand) of the target in order for the bullet to make course corrections, and the system had a minimum range of one kilometer, but when used by a trained operator the HB-4 could take down most big game in one well-placed hit.
- Galladinium's Fantastic Technology
- The Complete Star Wars Encyclopedia (As "HB-4")
- The Bounty Hunter Code: From the Files of Boba Fett