Because everyone should know if they've ever had a shotgun with full auto... Like I said, though, what you said about full auto is true for other weapons, like VoC and Oversoul Edict.
[spoiler]And The Stranger's Rifle. Who else remembers that?[/spoiler]
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I've never had two of the same shotguns with and without full auto so I can't be sure.
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Trust me, Found Verdict is much slower before you unlock full auto.