The E-9 rifle is a terran rifle, and was used during the Guild Wars by the Terran Confederacy
The following article or section contains lore from the StarCraft RPG, which is not regarded as canon. Elements may be regarded as 'flavor lore' however.
The E-9 was 10 mm automatic rifle. Its magazine capacity is just over half of the C-14 rifle. It was used by the Alliance after the Brood War.