Rifle

A rifle is a type of firearm. You fill it with bullets, point it at something you want to kill and it goes "bang, bang".

In fiction
A rifle is but one of the many weapons utilized by Rick Grimes and his group of survivors when they first secured the perimeter of the West Georgia Correctional Facility. While other members of the group guarded the front gate, Rick ran up to one of the guard towers and picked off walkers with a rifle.