H4 Heavy Weapons Droid

The H4 Heavy Weapons Droid was a droid built by Balmorran Arms.

Appearance
H4 Droids were bulky and heavy combat units with red photoreceptors and a cover made of Plasticene.

History
The H4 Heavy Weapons Droid was created by Balmorran Arms to assist soldiers in winning wars. H4 units had a back-mounted holster, so that they could carry a laser bazooka or other heavy weapon. The droids' heuristic processors and internal targeting system gave it a great aim when dealing with heavy weapons. H4 Units served many military outposts in the galaxy. Even the Empire and mercenaries used them to guard security outposts.

Trivia

 * This droid is based on an unnamed combat droid from Star Wars: Droids.

Source
The Essential Guide to Droids: Star Wars: Droids Edition