If the player Pack a Punches the Blundergat to the Sweeper and puts it in the acid gat kit it will become the Victrolic Withering. It can be Pack-a-Punched into the Vitrolic Withering, which shoots acid and attracts zombies, similar to the Monkey Bomb, and the Explosive Tip Crossbow's Pack-A-Punched variant, The Awful Lawton. It will shoot acid that sticks on surfaces which explode.
The Acid Gat Kit is a buildable in the Zombies Map, Mob of the Dead. This buildable is only compatible with the Blundergat and upgrades it into the Acid Gat.