21854 – Customize the launcher as you wish and win every battle. Both Nerf Modulus Mediator Barrel and Nerf Modulus Mediator Stock accessories are converted into launchers. Mount on the Nerf Modulus Mediator launcher and become the best (sold separately). With Nerf Modulus you can create more than 1000 combinations. (The grinder, the magazine and the accessories are sold separately).