He went to try out his new air gun.

He entered the forest with a shotgun.

He defeated the enemy using a sniper rifle.

He was handling the carbine carefully.

He headed to the battlefield with an assault rifle.

He is known as a French musketeer.

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

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

The police used a water cannon against the demonstrators.

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