How to Get the Armory of One achievement in Left 4 Dead 2

It's time to lock, load, and prepare to kill some zombies. In this Left 4 Dead 2 tutorial, you'll find out how to easily unlock the Armory of One achievement. In order to get it, you'll need to find and drop an ammo crate for your teammates to pick up. They spawn from explosive ammor to fire ammo and can be used to help end those zombies lives.