I have (had, Unequipped it in favor of my Ace of Spades) an auto rifle that can't be obtained, other than [i]emptying[/i] your primary slot.
Proof:
[spoiler]https://www.dropbox.com/s/3gpkq4k1480ly0n/photo%20oct%2021%2C%204%2026%2055%20pm.jpg?dl=0
https://www.dropbox.com/s/02v1pn01a3e614t/photo%20oct%2021%2C%204%2031%2008%20pm.jpg?dl=0
[/spoiler]
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How do you do this?