This aluminum tube is an extended barrel to the stock metal barrel, lengthen to 300mm to increase the chamber gas usage, the long barrel also enhance the accuracy as well. The tube built with outer diameter exact the same as the stock barrel, it fits well to the stock bolt adapter. Inner diameter further reduced to 13mm, close to the foam dart size to enhance air seal along the barrel.

The barrel tube set inside the barrel jacket, well protected and keep the blaster as original.