Kids can upgrade their blaster for any mission or battle with the Nerf Modulus Storage Stock. It easily attaches to Nerf Modulus blasters to provide added stability. The stock is extendable so battlers can adjust it for a custom fit. Flip open the stock butt to reveal storage for extra darts. Expand the customizing options with Nerf Modulus Upgrade Kits and accessories; with the full Nerf Modulus system, over 1000 different combinations are possible! Blasters, darts, upgrade kits, and accessories each sold separately.