What kind of weapons did the IG-227 Hailfire droid have?

15 guided missiles x 2

HAILFIRE DROID
Engineering MODEL IG-227 Hailfire-class droid tank

The IG-227 Hailfire-class droid tank is easily identified by its treaded, hoop-like drive wheels. The InterGalactic Banking Clan commissioned the construction of the hailfire prior to the Clone Wars, and the units saw their first combat against Republic troops during the Battle of Geonosis. A hailfire is an armored missile platform best used to destroy enemy vehicles. Each of the two launchers mounted on a hailfire can hold up to 15 guided missiles.

Rolling into battle

The hailfire is also called the wheel droid due to its maneuverable and speedy drive system (below). Each missile from the droid leaves behind a trail of black exhaust that darkens the sky (right).

_{^{Ultimate Star Wars}}

It also sports what the 'Rise of the Separatists' RPG sourcebook refers to as a

"forward-mounted twin auto-blaster"