The Battle Axe by SillybuttsThe Battle Axe is an internal magazine Silly Shell fed pump action shotgun style blaster designed by Sillybutts. Need a very specific type of ammo for a special zombie? Or maybe this next game mode only lets you use Rival? The Battle Axe has you covered, whatever your need is. The Battle Axe can take almost every variant of the Silly Shell system except for the sniper shell or any shell that has the dart sticking out the front (such as the Mega XL).