Here's how to get it:
1. Enter the Police Station: After escaping the Raccoon City Sewers, you'll find yourself in the Police Station's main lobby.
2. Go to the West Side: Head towards the western side of the lobby, passing through the "Save Room" marked by a typewriter.
3. Enter the West Office: You'll see a door with a green light on the left wall. Enter this office.
4. Find the Gun: The Handgun is located on a desk at the back of the room, along with some ammo.
The Handgun is a crucial weapon in the early stages of the game, offering a good balance of firepower and ammo efficiency. Don't forget to pick up some bullets for it in the same room!