I can't say if that's true or not, but in some locations you will hear NPCs mention something falling from the sky. There is a suggestion that the Alien Blaster Pistol only unlocks after an event which happens as you reach level 20.
That's not strictly true, as you can find it on the map with a little bit of searching.
I've heard a few rumours about how you can only get this gun from random events. One such weapon is the Alien Blaster Pistol. While we know there are 30 plus exceptional weapons, there are also a handful of very rare guns hidden in secret locations. There's a lot of secrets in Fallout 4, and a lot of hidden gear. An easy guide to getting one of the most devastating hand guns in Fallout 4.
