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Mercy is a unique 40mm grenade machinegun in Fallout: New Vegas.


A veritable relic, Mercy is a pre-War US Army automatic grenade launcher that was apparently used by one of the US Army's counter-insurgency units hunting Chinese Hei-Gui commandos in the American southwest. Presumably during this period, one of its operators spray-painted Hei Gui Bye Bye on the chassis. At an undetermined time, it was obtained by the Brotherhood of Steel and continued to serve as a weapon, eventually ending up in the hands of a Paladin in the Mojave chapter. It was lost when its operator was killed while exploring Dead Wind Cavern.


Its higher damage comes at the cost of using 40mm grenades, which are less common and more expensive than the 25mm grenade used by standard grenade machineguns. The larger size of the 40mm grenades also restricts its ammunition capacity to 18 grenades, which is 12 fewer than the regular grenade machinegun. The 40mm grenade is also heavier than its 25mm counterpart, further limiting the amount of ammo the player can carry in hardcore mode without being over-encumbered. Like most unique weapons, Mercy cannot be modded. This weapon looks extremely rusted and heavily used.


Mercy can fire a total of about 2495 standard rounds, the equivalent of 139 reloads, from full condition before breaking.



Weapon name (current weapon is highlighted)- Weapon name (melee or unarmed)Attacks in V.A.T.S.- Attacks in V.A.T.S.
Weapon name (current weapon is highlighted)- Weapon name (gun, energy or explosive)Action point cost- Action point cost
Damage per attack (damage per projectile)- Damage per attack (damage per projectile)Damage per action point- Damage per action point
Damage per second- Damage per secondWeapon spread- Weapon spread
Area of effect damage- Area of effect damageMagazine capacity (shots per reload)- Magazine capacity (shots per reload)
Effect damage & duration- Effect damage & durationDurability (number of attacks before breaking)- Durability (number of attacks before breaking)
Bonus effects- Bonus effectsWeight- Weight
Attacks per second- Attacks per secondValue in caps- Value in caps
Critical chance % multiplier- Critical chance % multiplierValue to weight ratio- Value to weight ratio
Critical damage- Critical damageSkill required- Skill required
Critical effect damage & duration- Critical effect damage & durationStrength required- Strength required
With all mods attached- With all mods attached
Weapon name (current weapon is highlighted)Damage per attack (damage per projectile)Damage per secondArea of effect damageAttacks per secondCritical Chance % multiplierCritical damageAction Point costDamage per action pointWeapon spreadMagazine capacity (shots per reload)Durability (number of attacks before breaking)WeightValue in capsValue to weight ratioSkill requiredStrength required
Grenade machinegun 0
Grenade machinegun With all weapon mods attached 0
Mercy 5


Dead Wind Cavern - By a dead Brotherhood of Steel paladin along with some 40mm grenades, 40mm incendiary grenades and T-45d power armor and helmet. It is guarded by various types of deathclaws and the legendary deathclaw.


This gun is related to Vengeance from Fallout 3, in the fact that both guns are very powerful, are heavy weapons, found in the main deathclaw caves, and their names are antonyms of each other.

Behind the scenes

The writing on the "display" is easily recognizable as part of a Bash script, a scripting language that is used for UNIX and UNIX-like operating systems like Plan9, Linux, BSD, Darwin, or MacOS. The script that the display shows seems to be a repeated conditional that prints an error, prints the correct usage, then exits with an error.


  • PCPC Playstation 3Playstation 3 Xbox 360Xbox 360 The game may crash if you fire continuously in the same place. [verified]
  • Xbox 360Xbox 360 The weapon can disappear from your game. [verified]


Grenade machinegun icon.png ReloadVB.png