Worker Scar Barrel
As blasters become more powerful and engagement distances become greater, the need for accuracy becomes more important.
After a lot of experimentation within the community, scar barrels quickly became the easiest way to give a more stable trajectory to your darts and they do this by imparting spin. a spinning projectile is inherantly more stable and therefore, maintains a more predictable path.
Scar barrels are psrticularly suited to high powered springers and HPA blasters. Note that they are relatively useless in blasters under 140fps and in flywheelers.