This barrel and spring will push the Worker Swift over 300 FPS with most dart types if you have a good seal. This barrel is VERY long at 55cm (21.5 inches), and will protrude past the tip of the stock blaster and muzzle. Comes with a 1.6 mm wire diameter spring which is on the heavier side.
Blasters should be modified at your own risk by an adult or with adult supervision. Modification of blasters may increase wear and reduce lifespan of blaster. Always wear eye protection. Never point at someone’s face. By purchasing, you agree that FoamBlast is not responsible for injury or damage caused by misuse or accidental usage.