See the full review at http://www.timetoplaymag.com/toys/2821/hasbro/nerf-vortex-nitron/

This is a fully automatic clip-fed disc blaster. It features a removable clip that can hold up to 20 discs, an electronic targeting scope accessory, and a front handle to steady shots. The Nitron is also compatible with the Nerf Tactical Rail System and most Nerf N-Strike Mission Kit accessories, each sold separately. It comes with 20 discs, and more discs can be purchased separately.