For His Quirk, Izuku Wields a Gun

As the title says, Izuku is granted the ability to summon his very first pistol at the age of four, a Kolibri. Interested in everything firearm related, he trains his Quirk so that it may evolve into something more powerful. This is the story of how he became the world's perfect soldier. Events won't proceed the way you might think. (AU)