The Worker MOD 20cm Alloy Barrel Tubeis specially design for metal flywheel cage, this allow a complete connection between the cage to the muzzle, which ensure the darts go stedy to enhance accuracy.

The internal diameter of the tube is 14mm, which give the minimum size for an elite darts, the outer diameter after dressing the plastic tube is 19mm, this allow you to wear a flash hider onto the barrel.