The Salvaged Assaultron head is an energy weapon in the Fallout 4 add-on, Automatron.
The severed head of a generic Assaultron, this unique weapon fires a devastating red laser beam, that can be focused on a single target for extended damage. The head requires it to be reloaded to charge up its ray, and can be reloaded up to five times, in order to increase its damage output, essentially making it a 5-Crank Laser Musket without the requirement of Science! 3. However, as a trade off for its damage output, the head will irradiate the user severely, at 49 rads per discharge.
There are no mods for this weapon.
The salvaged Assaultron head can be found in a storage room at the end of the Fort Hagen hangar dungeon, in a bin next to the steamer trunk.