If you love the gauss rifle look at the unique version.
The unique gauss rifle or (alien blaster location)
The unique gauss rifle is located on the left top corner of the map.
When you get there. Their will be 5-6 mercenarys there at a camp fire. They are usually in a circle.
Get prepared cause most of the time thery shoot you on sight. The one with the mark ll combat armor has the gauss rifle. Kill them all and get also get some cool armor.
******IMPORTANT****** If you have the wild wasteland trait you cannot attain the unique gauss rifle instead their will be aliens with a different unique weapon called the alien blaster.