Kids can upgrade their firepower when they attach the Modulus Mediator Barrel to the Modulus Mediator core (sold separately). The barrel converts to blaster that features pressurized 3-dart blasting. Flip the handle to go from barrel to blaster, pump to prime the blaster, then press the button to blast a triple-dart burst. Comes with 3 Modulus Elite darts. Customize for battle with the Mediator core, stock, and barrel (each sold separately) to create the Mediator XL. With the entire Modulus system, more than 1000 combinations are possible! (Blasters, upgrade kits, and accessories each sold separately).