The weapon is capable of devastating damage and can pose a serious threat. It appears to be box-fed and semi automatic, and is of relatively large size. Like the Pulse Rifle and Heavy Machine Gun, it cannot be picked up or used by the player. Chargers use these weapons to dangerous effect, and it is especially lethal in close quarters.
The rear of this weapon shares visual similarities with the Combine Shotgun, suggesting the two are related in some way.
Behind the scenes
In the first released screenshots of Alyx, the Suppressor was shown to be using the Heavy Shotgun instead of the Heavy Machine Gun.