“Form a pistol in my hand. Load with magic bullets. Application is firing. One will suffice.”

[…]

As Aureolus gently waved his hand, a sword appeared. At first impression, it was a Western sword that a fairy tale prince would use, but was slightly different. Where the hilt should have been was a pirate’s musket pistol. It was a sort of gun with a strange projectile.

[…]

"Begin to fire at a speed that surpasses human motion recognition.”
Seemingly desiring to rip apart the air, he swung the Western sword horizontally, which came with the sound of exploding gunpowder. The next instant, Kamijou felt something barely brush past his face and, after that, blue-white bullets struck the wall behind him and exploded.

Toaru Majutsu no Index vol.2 ch.4 pt.1