The Planet Eclipse Shaft4 Boost Kit comes with bore sizes of .685 and .693. It was developed specifically to improve efficiency, consistency and accuracy, and will give you higher velocities than previous Shaft barrels. Please note that anodizing varies from batch to batch, so your Shaft 4 Barrel kit may be a slighlty different shade than your marker (you have been warned).
Manufactured using the same high grade aluminum to the same exacting standards as all other Shaft barrels
Compatible with Ego11, Geo2 and Shaft4 barrels. Not Compatible with Shaft3 backs