Kill the Zombies!!

it keeps telling me Ive got shotgun shells. wtf? When do you get a shotgun?
 
Level 15 and dint need the shotgun, too ez. I gave up.
 
It tells you when you get the shotgun, and when you find more shells for it. You hit the shift key to switch. So far I've actually done better just sticking to the revolver.
 
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