Growler is a PKM machine gun that fires larger rounds than its predecessor, Rattler. Growler fires 7.62 millimeter rounds and is much larger than Rattler. It has a bipod should the weapon ever need to be mounted. The weapon is fed bullets via an autoloader mounted on Mach's Power Armor. The weapon gets its name from the sound of its gunfire/report that sounds almost like a low and dangerous growl, according to Mach.