Old Faithful

Old Faithful is a unique laser pistol found in Fallout 4.

Characteristics
Old Faithful bears the Instigating effect, which does double damage if the target is at full health, making it a strong choice early in the game for stealthy characters, as a sneak attack against an enemy at full health will deal quadruple the base damage. The specific weapon modifications fitted to the gun when purchased are level dependent and will vary. As with all laser pistols in Fallout 4 it can be converted to a rifle, expanding its usefulness to Rifleman characters as well as Gunslingers and Commandos.

Variants

 * Laser gun - Standard version.
 * Survivor's Special, a unique laser gun that deals more damage the lower your health is. It is a potential reward for completing the quest The Lost Patrol. It is also possible to steal the item from Paladin Brandis, before the The Lost Patrol quest ends.
 * Good Intentions, a unique laser gun that, on critical hits, causes targets to frenzy. It is carried by Clint.
 * Prototype UP77 "Limitless Potential", a unique laser gun, can be found in a master Lockpick level safe, in the University Credit Union. It has unlimited ammo capacity and never requires reloading, the magazine size is equal to all fusion cells currently in inventory.
 * Righteous Authority, a unique laser rifle, given as a reward for completing the Call to Arms quest. Its critical hits do double damage and the critical meter fills 15% faster.
 * Wazer Wifle, a unique laser rifle similar to the Prototype UP77 "Limitless Potential", it is given as a reward for completing three unmarked quests for Shaun after ending the main quest with any faction.

Location
Sold by Arturo Rodriguez in the Diamond City market.