Buzz Bee Toys 8 Dart & 6 Shell Refill Pack for Double Shot, Mustang 6, Rapid Fire Tek by BuzzBee Toys. $13.14. Have a Rapid Fire Rifle, Mustang 6, or a Double Shot and wondering where the heck to get more shells and darts? Right here. These spare shells and darts are official BuzzBee merchandise, made for the Buzz Bee Ruff Stuff and Air Blasters toys. The darts work in all the dart guns while the shells work in the shell firing toys including the Mustang 6.