The Alien Blaster can be found with 329 Alien Power Cells to use as ammo, and can be found if you watch and follow this video youtube.com/watch?v=VJmkfidkFY0 Exact spot on the map is here images2.wikia.nocookie.net/fallout/image... More detailed information can be found in the links below.
If you travel directly north of the Minefield, southeast from Cliffside Shacks, or southwest from Vault 92, you'll eventually pick up a radio signal titled "Recon Craft Theta Beacon. " Keep it on and search around the area until you find a crashed alien space ship. If the signal disappears, you'll know that you ventured too far.
Move around to the front of the spaceship and you'll see a dead alien with a Alien Blaster on the floor. Pick up the blaster along with all of the ammo since its the only ammo for this gun that you'll be able to find in the game. To the northeast of the Smith Casey Garage, there is a large crater.At the bottom of this crater there is an overturned military truck containing approximately 96 Alien Energy Cells.
Here is another question on Answers about the alien blaster. It has a few answers that might be helpful to you. mahalo.com/answers/video-games/has-any-o....
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