The MadBull 6.03 tightbore barrel increases accuracy and velocity. This model fits all M4 and M15A4 Carbines, as well as some other carbine length models.
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 363mm barrel will fit M4 Carbines, G36K, and other similar length AEGs.