The AP-3 resembled an astromech droid but it was armed with six missile launchers and micro-proton torpedoes. It also possessed a repulsorlift drive that enabled it to move quicker across the battlefield at the order of an AP-1-C.
The Imperial Ap-3 Attack Droid C model was designed for the abandoned The Epic Continues story line. The prototype model was made by kitbashing figures of FX-7 and a Power droid.