Backup Magazine

The Backup Magazine is a new item in Risk of Rain 2. It gives the player the ability to hold an additional charge of their secondary, or "M2" skill. Unlike, this item does not reduce the cooldown of your secondary skill. It allows you to throw out a quick burst of damage by spam clicking your secondary attack button.

Trivia

 * Upon picking up his first Backup Magazine, Commando seems to attach it on the magazine of both of his guns.