Suitable for short darts with different inner diameters. The 13mm inner diameter reducer pipe is a fixed interface that connect to the blaster bolt, and others reduced tubes can be add by yourself to improve the performance of the blaster.
 
Before use, apply lubricating oil to the threads of the 13mm inner diameter reducer pipe so that it can be unscrewed from the launcher. For other inner diameter sizes, no lubricating oil is needed; just tighten them.

Key Feature: Enhances launcher performance.
Include: 1 piece each of reducer pipes with inner diameters of 13mm, 12.9mm, 12.8mm, and 12.7mm.