Hogwarts: Harry Potter and the Glock 18

Glock has a tattoo on his head, and he was born as a social person.
When the wizard no longer holds the stick,
When the Muggle points crooked the technology tree.
When the muzzle shines with magic!
The burst of magic replaces the smoke of gunpowder,
The shock of the roar did not diminish in the slightest.
Extraordinary power should never be silent!
Welcome to Hogwarts School of Wizardry and Warfare.
This book is faithful to the original work, without any magic changes——A.K. Rowling