I Sell Weapons at Hogwarts

Are you afraid of firearms that can shoot magic? What? You're not scared of those little squirt guns that only shoot "Aguamenti" and take three minutes to reload after one use? Oh, my dear customer, I'm not talking about those children's toys. I'm talking about the new big toys only big kids can use!

Please look this way:

Expelliarmus Colt! Its immense power guarantees equality for all; even Voldemort would drop his wand if hit!

Stupefy Gatling! Three thousand six hundred rounds per breath—no one can stand for more than a second under its firing muzzle!

Confringo Remington! Even Gringotts' vault door can be blown open with a single shot!