My high school has very strict rules.

My university is in Tokyo.

He went to try out his new air gun.

He headed to the battlefield with an assault rifle.

He was handling the carbine carefully.

He defeated the enemy using a sniper rifle.

He entered the forest with a shotgun.

He picked up the ray gun and fired it at the alien.

An electron gun is a device for generating an electron beam.

This story perfectly practices the principle of Chekhov's gun.