Zeta gun

The Zeta gun is a unique weapon in Fallout 4 and a possible reward for completing The Secret of Cabot House.

Characteristics
The Zeta gun is a specially modded Gamma gun that does a low amount of damage without any special radiation poisoning effect. It is also significantly weaker than the Lorenzo's Artifact gun that can also be gained as a reward for The Secret of Cabot House. Because of these facts, it appears that this weapon might be an intentionally weak weapon to be used as a "consolation prize" of sorts for siding with Lorenzo instead of Jack (though siding with Lorenzo also gets the player character a replenishable supply of the powerful Mysterious serum, which may more than compensate for the weakness of this weapon).

Jack's notes state that, as a mobile version of Lorenzo's psychic restraint, it may be used to weaken Lorenzo while fighting him. The drop in damage may be explained by the gun giving off "Zeta Radiation," a supposedly harmless energy to normal people, but to Lorenzo it can prove lethal.

Like the Lorenzo's Artifact, this is actually a normal Gamma gun with a unique mod (the Zeta dish); it is possible for the player to build the standard dish mod to restore the Gamma gun's original power, and apply the Zeta dish mod to another Gamma gun.

Variants

 * Gamma gun
 * Lorenzo's Artifact

Locations

 * If the Sole Survivor sided with Lorenzo, this will be found on Jack.
 * Regardless of who the player character sides with, a Zeta gun can still be found in Cabot House, located on the science lab table.

Behind the scenes
The weapon's name is a reference to the alien race Zetans; this is further supported when Jack asks the player character if they believe in aliens at the start of Special Delivery.