Fallout 4: How to Get Experiment 18-A

Experiment 18-A is a unique automatic plasma rifle, with a legendary effect, and you can purchase it from a vendor in Fallout 4.

Fallout 4 Experiment 18-A stats tooltip

Experiment 18-A is a unique automatic plasma rifle dealing physical and energy damage on impact. Moreover, it comes with the Rapid Legendary effect, which grants it a 25% faster fire rate and 15% faster reload. This is a great weapon you should immediately acquire on your first visit to the Institute.

Experiment 18-A Location and where to find in Fallout 4:

  • Location: The Institute, purchase from the synth requisition officer merchant
  • Dropped by/Looted From: This rifle does not drop from enemies in the game; it can only be purchased from the requisition officer at the Institute.

How to Get Experiment 18-A in Fallout 4

Fallout 4 How to Get Experiment 18-A

To get Experiment 18-A in Fallout 4, you must visit the Institute while on good terms with the organization and buy the gun from the requisition officer. The Institute is located southeast of Sanctuary, hidden underneath the former Commonwealth Institute of Technology (C.I.T.).

The organization is one of the major players of the Commonwealth, with many quests and story choices connected to it. Completing certain quests for the Institute can make you an enemy of other factions. However, there is a space of time initially when they are non-hostile, and you should aim to purchase this weapon as soon as the vendor is available.

You cannot enter the Institute until you reach a series of main story quests, starting with The Molecular Level. Then, you will find Dr. Brian Virgil, who was once a member of the Institute and has a chip that can help you get inside. Follow the quest objectives, and eventually, you’ll need to choose to become an ally of one of three factions: the Railroad, Minutemen, or Brotherhood of Steel.

Each will have an NPC that can help you build the teleport device. Once the teleporter has completed it, speak to the faction expert, and they will assist you in using the device. Finally, inside the Institute, you will start the institutionalized quest. Agree to join the Institute or to think about it, and you will be given leave to explore the facility.

Before completing any more quests, head down to the bottom floor. Directly off the main elevator, look for a sign of a glowing green shopping bag. Head inside, and you will find the synth requisition officer.

Experiment 18-A Stats, Perks, & How to Use It in Fallout 4

Fallout 4 Experiment 18-A stats tooltip

Experiment 18-A Stats and Effects in Fallout 4:

  • Weapon Type: Unique Energy Weapon
  • Effect(s): Rapid Legendary effect
  • Base Damage: 24 Physical, 24 Energy
  • Ammo: Plasma cartridge
  • Clip Size: 36
  • Fire Rate: 136
  • Range: 203
  • Accuracy: 140
  • Value: 1809
  • Weight: 6.6

How to use Experiment 18-A

In Fallout 4, Experiment 18-A is a unique automatic plasma rifle that is a good pick for close or medium-range combat. Depending on your build, you will want to change the Barrel to non-automatic if you are using the Rifleman perk. The Commando perk will benefit from automatic firing, so it’s important to modify the weapon to ensure the proper perk is used. The Grip can also be modified to Marksman’s Stock for a marksman’s sniper rifle build.

Furthermore, the Rapid Legendary effect boosts both the weapon’s fire rate and reload time. The only downside is that Experiment 18-A uses plasma cartridges as ammo, and it’s hard to find vast quantities in the game. Therefore, we do not recommend putting an Automatic barrel mod on this weapon, as that would burn through your ammo even faster.

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