Fallout 2 - Finding the Alien Blaster 

Just wander around the two most northern tiles parallel to Modoc and you'll encounter this douche who'll try to sell you shit. Pickpocket him just to check his inventory, and if it isn't an Alien Blaster (or even something you'd want), just leave and start wandering the tiles again.
Fallout 2 -
drive.google.com/file/d/1-Ymx... (GOG)
drive.google.com/file/d/1vCbB... (CD Release)
drive.google.com/file/d/12DW4... (Portable)
Fallout 1 -
drive.google.com/file/d/1i2zM... (GOG) [Password: password] {IGG Games}
drive.google.com/file/d/1FbsY... (CD Release)
drive.google.com/file/d/1GFFY... (Portable)
Fallout Tactics (because why not) -
drive.google.com/file/d/10Iy3... (GOG) [Password: password] {IGG Games}
drive.google.com/file/d/116Ig... (CD Release)

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