This guide shows how to find the Alien Blaster Pistol. (Unique Weapon)
Other Fallout 76 Guides:
Alien Blaster Stats
Alien Blaster Location
The location is not far from Philippi Battlefield Cemetery.
In the middle of the pond, there is a safe. It exactly that place where you can find the Alien Blaster Pistol.
Ammo Location
Firstly, you must find the TNT Dome Key 2 in the Abandoned Mine Shaft Elaine / Mount Blair Trainyard locations.
Secondly, you must find a closed bunker near the Black Mountain Ordnance Works.
Have fun!