The MadBull 6.03 tightbore barrel increases accuracy and velocity. This model fits all Mk5 models, as well as other compact CQB airsoft rifles
Mad Bull\\'s Black Python tightbore inner barrels are anodized aluminum and feature an inside diameter of 6.03mm. This tighter inside diameter and more consistent interior finish make the MadBull tightbore barrels significantly more accurate than stock airsoft rifle barrels.
The 229mm barrel will fit Mk5 airsoft rifles, as well as the Classic Army M15A4 CQB Compact.