History:
This mod is a continuation of a mod I made for Fallout 3 called Nuke Gun. Check out the video from 2009 below! The mod I bring you now is the way I always wanted the Nuke Gun to be. Today, it is called the Primordial NG-2.
The NG-2 is the pinnacle of advanced experimental weaponry created before the war. It didn't see much usage in combat before the bombs fell but did well in testing. There is only one. The video below shows where to get it.



How it works:
The NG-2 is a specialized Minigun made to fire a unique variant of 5mm rounds. These are called ExNG-2 Rounds. They look like normal rounds but their appearance consists of a steel casing (apposed to bronze) and a smiley face on the bullet. See photos! Even in vats, you can see the smiley face! Within the bullet is a hidden micro explosive. These rounds unleash a miniature atomic blast upon impact. Like a Fatman, except full auto and there is no bullet drop. They go straight for their target and then obliterate it. The best perk about this weapon is that there is no blindly bright light from the detonations due to the custom explosion I created. Shoot as much as you want, you won't be blinded.

This weapon is completely customizable at a weapon workbench.  

How to get:
The video above shows a video process on obtaining it. But it's fairly simple. West to the Atom Cats, there is a Military Checkpoint consisting of 2 APC's on a barge with containers. Most likely, a Mr. Gutsy will be guarding the area. Next to the APC's, there's a security gate. Inside you will find the weapon and its ammo.
For more ammo, use "player.additem XX000814 <insert amount here>". XX is your load order. Don't actually put XX in there. Or you can craft it at a chem station.

Compatibility or anything else I should know??
This mod modifies the WorldSpace. Most likely, you won't encounter any problems as most modders on the nexus aren't familiar with placing objects into the world without the Creation Kit. Furthermore, they would have to edit this cell that the NG-2 is located in. Very unlikely. But things happen you know. 

Frame rate does drop a bit during extended use of pulling the trigger. But it's nothing that bad. I minimized the damage to your frames as best I could!

Changelog:
2.0   -First one
2.1   -Added ammo craftability to chem station 
-New ba2 archives for easy manual installation
-Put NG2 behind a locked security gate. Same locash.

Nuke Gun 1.0 video:

Check out my other mods!
Firelance -Standalone Alien Blaster Variant
Gojira - Giant Standalone Deathclaw
Reilly's Rangers Combat Armor -Standalone
Reilly's Rangers Power Armor Paint -Standalone
Broken Hunting Rifle lol
Old World Radio - Boston