Home > Borderlands 3 > Unlock One Pump Chump

How To Unlock One Pump Chump Legendary Gun In Borderlands 3

Published Date :

One Pump Chump is a very powerful Weapon in Borderlands 3, with over +1400 Weapon damage, 3.5x Zoom and 50% chance not to consume ammo when fired this weapon is a true killing machine. One Pump Chump can be unlocked by defeating the One Punch Pschyo who spawns near New-U Station. In this Borderlands 3 Weapon guide, you can find a solution where to find One Pump Chump gun and how to unlock this powerful legendary weapon.

How To Get One Pump Chump Gun

You will need to visit Promethea Planet to find One Pump Chump Gun. Go to New-U Station in Lectra City and find the subway near the station. Enter it, and look for a narrow corridor on the left of the first area. There will be some enemies in this region, clear them. Kill everyone before you get in contact with the boss, his damage is very high and these small enemies will annoy you in the fight.

After this, you will have to solve a small puzzle to unlock the door. The puzzle solution is listed below. After unlocking kill One Punch Psycho and he will drop the gun. Use it against the bosses in the game. The weapon can have only 1 bullet but due to 50% chance not to consume ammo when fired, you might get additional shots for free.

How to Solve The Puzzle To Spawn One Punch Psycho

To unlock the door you have to do four things, interact with the leftmost button, then go right and turn the valve. On the right of the valve on the ground there is a lever, pull it and return back to the safe door, draw the lever up on the right side. This is enough to unlock the safe. Most of the time you will get the gun after killing the psycho but if you are not getting it then exit the game right at the point and respawn. Go back to the same place again and repeat the complete process.

One Pump Chump Weapon Stats:

  • Damage: 192
  • Accuracy: 89%
  • Handling: 61%
  • Reload Time: 1.1s
  • Fire Rate: 1.61/s
  • Magazine Size: 1
  • +1425% Weapon Damage
  • 3.5x Weapon Zoom
  • 50% chance not to consume ammo when fired

How to kill One Punch Pschyo

The only way to take down One Punch Psycho is by using a high DPS weapon and dodging at the right time. The enemy refers to famous anime character One Punch Man who has a superpower of killing anyone in one punch. So get a good weapon first, and dodge way at the right time before the enemy punches you to death. With one single punch, you will die so be ready to dodge whenever possible. If you can maintain a good distance then it will be easy for you to kill One Punch Psycho.

 

  • Snipers VS Runners Codes (August 2026)

    Snipers VS Runners Codes (August 2026)

    Published Date :

    Snipers VS Runners turns a simple race into a high-stakes battle where one side is trying to reach the finish while the other is waiting for the perfect shot. Runners have to ensure they reach the finish line, while snipers need to predict their opponents’ movements and pick them off before they escape. Cash from… Read More

  • Rock Fruit Codes (August 2026)

    Rock Fruit Codes (August 2026)

    Published Date :

    Rock Fruit drops you into a pirate adventure where you’ll explore islands, fight enemies, collect powerful abilities, and work your way toward becoming the strongest player. Battles can get much tougher as you progress, so having extra potions, Diamonds, and Beli can make quite a difference when you’re trying to level up. The latest Rock… Read More

  • Chicken Farm Codes (August 2026)

    Chicken Farm Codes (August 2026)

    Published Date :

    Chicken Farm is one of the most addictive games I have played on Roblox! The gameplay is simple but hooks you right away – you buy chickens, convert eggs to cash, and help you get richer as you play! If you want to start investing time into your very own farm, you will need all… Read More

  • Anime RNG Defense Codes (August 2026)

    Anime RNG Defense Codes (August 2026)

    Published Date :

    Anime RNG Defense combines random rolls with tower defense, so building a strong lineup comes down to getting powerful units and making the most of every roll. As you start getting tougher enemies, you’ll need plenty of Crystals and rolls to improve your collection and find stronger characters. Some rewards also require you to reach… Read More