Well, some families are magical. Occasionally witches and wizards are born from otherwise human families, or there's mixed blood going on. We're not rare as such, but compared to the overall population we're definitely the minority. Muggles- non magic people- don't know we exist. We have our own Ministry, our own school, our own enforcement.
Gunblades sound amazing and terrifying, all at once. So you're one of the specialists?