9 barrels. Why?

Think of the recoil...

Because fuck you nine times

Sam and Dean are heavily breathing somewhere

Lord have mercy

Finally, a shotgun suits for my needs

Fucking overkill

Because why not.
If something is worth doing, it's worth OVERdoing.

Damn, you really want that cat dead

I'll need 10

Think of all the useless burglars and gangbangers I could shoot.

At this point if you can pick that gun up then you don't even need it. That thing must way a ton

Why? Because we all know pussies have 9 lives.