I was trying to figure out why my Iron Banner primary weapon headshots weren't counting on the Bounty... and then I realized it, I'm using Universal Remote, and somewhere the software believes this is a secondary weapon, even though you equip it as a primary. Now I has a sad.
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That's because it's a shotgun. The fact you can use it as a primary is to add some sort of customisation in the field of weapons because God knows it's lacking customisation across the whole game. Still it's a shotgun.