I thought that the best way to make the infamous Fortnite Pump Shotty actually usable is to convert it to Elite, then slap a 25 round drum in front of it. :
Nerf's Gjallarhorn rocket launcher from Destiny is truly gigantic — preorders are now open - The Verge
Amazon.com: NERF Infinus N-Strike Elite Toy Motorized Blaster with Speed-Load Technology : Toys & Games