Madbull Airsoft Tightbore Barrel (Ultimate 6.01mm Aluminum 7075 T6, Length 363mm)

The new Ultimate series puts to use a new manufacturing process which promises and thicker, stronger barrel with more precise tooling to produce a more constant and precise inner diameter yet still be fully compatible. This model is designed to fit the M4 / SR16 / SG551 AEGs and serves as a tightbore barrel to improve the air seal for more accuracy, stability, reliability and some power.