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The Prototype UP77 "Limitless Potential" is a unique laser gun in Fallout 4.

Characteristics[edit | edit source]

This unique laser gun possesses the Never Ending effect, which grants an unlimited magazine capacity and never needs to be reloaded, but still requires ammunition to fire.

Weapon modifications[edit | edit source]

The specific weapon modifications fitted to the gun when found are level dependent and will vary.

Slot Mod Description Modified name Science! rank Base ID
Capacitor Standard capacitor Standard. - - 001A8A88
Photon exciter Improved critical shot damage and accuracy. Excited - 00187AA2
Beta wave tuner Adds burning damage. Improved range. Incendiary - 00187AA0
Boosted capacitor Improved damage. Reduced ammo capacity. Boosted - 00187AA4
Photon agitator Superior critical shot damage, accuracy and ammo capacity. Agitated - 00187AA3
Gamma wave emitter Adds better burning damage. Better range and ammo capacity. Fiery 1 00187AA1
Maximized capacitor Better damage. Maximized 2 00187AA7
Boosted photon agitator Superior critical shot damage and ammo capacity. Better accuracy. Improved damage. Boosted agitated 2 00187AA6
Boosted gamma wave emitter Adds better burning damage. Superior ammo capacity. Better range. Improved damage. Boosted fiery 2 00187AA5
Overcharged capacitor Superior damage. Improved ammo capacity. Overcharged 3 00187AA8
Barrel Short barrel Standard. Short (for rifles) - 00187A8E
Long barrel Better range. Improved damage, sighted accuracy and recoil. Reduced ammo capacity. Poor hip-fire accuracy. Long (for pistols) - 00187A8C
Automatic barrel Improved rate of fire, range and sighted accuracy. Worse recoil. Reduced ammo capacity. Poor hip-fire accuracy. Automatic 1 00187A90
Sniper barrel Superior damage and range. Worse recoil. Poor ammo capacity and hip-fire accuracy. Charging 1 00187A92
Improved short barrel Improved damage. Improved short (for rifles)
Improved
1 00187A8F
Improved long barrel Better damage and range. Improved sighted accuracy and recoil. Reduced ammo capacity. Poor hip-fire accuracy. Improved long (for pistols)
Improved
2 00187A8D
Improved automatic barrel Superior rate of fire. Improved damage, range and sighted accuracy. Worse recoil. Reduced ammo capacity. Poor hip-fire accuracy. Improved automatic 2 00187A91
Improved sniper barrel Exceptional damage. Superior range. Worse recoil. Poor ammo-capacity and hip-fire accuracy. Improved charging 2 000187A3
Grip Standard grip Standard. Pistol - 001A8A87
Comfort grip Improved recoil and hip-fire accuracy. Comfort grip pistol - 00187A94
Short stock Exceptional sighted accuracy. Better recoil and aim with scopes. Improved bash. Rifle - 00187A99
Sharpshooter's grip Better recoil and hip-fire accuracy. Sharpshooter's pistol 1 00187A95
Full stock Exceptional sighted accuracy. Better recoil and aim with scopes. Improved bash. Rifle 1 00187A96
Markman's stock Exceptional sighted accuracy. Superior recoil and aim with scopes. Improved bash. Marksman's rifle 2 00187A97
Recoil compensating stock Exceptional sighted accuracy and recoil. Better aim with scopes. Improved bash. Recoil compensated rifle 2 00187A98
Sight Standard sights Standard. - - 0001D374
Improved sights Improved focus and sighted accuracy. Sighted - 00187AB2
Short scope Improved magnification. Superior sighted accuracy. Scoped - 00187AAD
Reflex sight Better focus and sighted accuracy. Tactical 1 00187AB1
Medium scope Better magnification. Superior sighted accuracy. Scoped 1 00187AAB
Long scope Superior magnification and sighted accuracy. Scoped 2 00187AA9
Short night vision scope Night vision. Improved magnification. Superior sighted accuracy. Night-vision 2 00187AAE
Medium night vision scope Night vision. Better magnification. Superior sighted accuracy. Night-vision 2 00187AAC
Long night vision scope Night vision. Superior magnification and sighted accuracy. Night-vision 2 00187AAA
Short recon scope Tracks targets. Improved magnification. Superior sighted accuracy. Recon 3 002492DC
Long recon scope Tracks targets. Superior magnification and sighted accuracy. Recon 3 00187AB0
Muzzle No muzzle - - - -
Beam splitter Splits beams into multiple projectiles covering a wider area. Poor accuracy and range. Scattered 1 00187A9E
Beam focuser Better range, accuracy, and recoil. Focused 1 00187A9C
Gyro compensating lens Superior recoil. Reduced range. Targeting 1 00187A9A
Amplified beam splitter Splits beams into multiple projectiles covering a wider area. Reduced accuracy. Poor range. Improved scattered 2 00187A9F
Fine-tuned beam focuser Super range and accuracy. Better recoil. Improved focused 2 00187A9D
Quantum gyro compensating lens Exceptional recoil. Reduced range. Improved targeting 3 00187A9B

Variants[edit | edit source]

  • Laser gun, the standard variant.
  • Old Faithful, a unique laser pistol with the Instigating effect, which does double damage if the target is at full health. It is sold by Arturo Rodriguez in Diamond City.
  • Survivor's Special, a unique laser pistol with the Bloodied effect, which deals more damage the lower your health is. It is a potential reward for completing The Lost Patrol, or it can be stolen from Paladin Brandis before completing the quest.
  • Good Intentions, a unique laser rifle with the Enraging effect which, on critical hits, causes targets to frenzy. It is carried by Clint.
  • Righteous Authority, a unique laser rifle. With the Lucky effect, its critical hits do double damage and the critical meter fills 15% faster. It is given as a reward for completing Call to Arms.
  • Wazer Wifle, a unique laser rifle with the Never Ending effect, which gives the weapon unlimited ammo capacity and remove the need for reloading. It is given as a reward for completing three unmarked quests for Shaun after finishing the main quest with any faction.
  • Automatron (add-on) Protectron's Gaze, a unique laser pistol with the Rapid ability, boosting its fire rate by 25% and its reload time by 15%. It is carried by the Mechanist.

Location[edit | edit source]

The UP77 is found in University Credit Union at University Point. Inside the Credit Union, one will find a bank vault with a Novice-locked terminal. After hacking and opening the vault's door, the Sole Survivor will be in a room with some locked safes. On the second row, there will be a Master-locked safe; opening the safe will reveal a red button. Pressing it will open a wall to the right and on the large table in the middle of the room will be the UP77.

Notes[edit | edit source]

In the Prima game guide, this weapon is falsely listed as Prototype PA77. It also says it is inside of a safe.

Bugs[edit | edit source]

Playstation 4Icon ps4.png Xbox OneIcon xboxone.png Two prototype UP77's with different mods installed may spawn.[verified]

Gallery[edit | edit source]

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