MadBull 6.01mm x 363mm Tightbore Inner Barrel

The bore of this barrel is so tight around the BB that even the smallest obstruction in the barrel will cause a jam when fired, however this also provides an unparalleled quality of tight bore barrel not seen from any other brands.  This barrel is really recommended for more advanced/experienced players that take the responsibility to clean their barrels regularly in order to avoid jams.