Turns out I'm pretty bad at this. Hopefully no more updates.
Also this mod is close to useless.

This mod does three things:

• The GenSec Elite shotgunner currently in use (r870 variant) now uses the old shotgunner model
  
• GenSec Elite and Heavy use the M1014 (benelli) like the old shotgunner unit (must be host to see this change)
  
• The models of two of the street cops were switched so the guy with shotgun shells on him uses the shotgun now
  

Install by unzipping and placing the "Shotgunners (with M1014)" folder your into mod_overrides. Delete old version if updating or switching the the alternate version. Requires BeardLib

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Note: There's a slight gameplay impact because of the benelli change that you'll probably never notice (some scripted spawns on Death Sentence will do less damage). You may have unintended side effects if you use a difficulty rebalance mod. Use the visual only version instead if you're worried about these issues: https://modworkshop.net/mydownloads.php?action=view_down&did=24271

Leave a comment if you have any issues or know of any other units I can edit.
Big thanks to Zdann for helping fix my rookie mistakes.