The Action Army 6.03mm AEG Barrel .
Fits inside AEGs that require this length. This is a 6.03 inner barrel diameter, so it allows for less jams and tolerances than the 6.01mm. One piece high grade metal machined. Precision smooth inner bore with nickel plating. This inner barrel is an upgrade to improve your gun's performance, accuracy, FPS, and range compared to stock gun barrels.
