That shotgun is from one of Halo games, Halo Reach, if I'm not mistaken. So it's unlikely it'll be ported to Fallout 4, at least on the Nexus or Bethnet. If you REALLY want it badly, you can always create an account on Gaming Underground Network (http://www.gunetwork.org/) and post a request for someone to make it. If you do go that route though, there are a couple really nice shotgun mods already available on the site. An AA-12, and the Haymaker 12 from Call of Duty: Black Ops 3.
Here's a link to an image of the AA-12: http://modgames.net/_ld/213/19059603.jpg And here's a look at the Haymaker 12: https://fallout-fanclub.ucoz.ru/_ld/15/84462675.jpg
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And here's a look at the Haymaker 12: https://fallout-fanclub.ucoz.ru/_ld/15/84462675.jpg
but its a powerful gunshot
echo its part of it
well done