RG108 is a launcherless B.B. Shower. You only need to attach this grenade to the specially designed flash hider (included). Then, you fire a B.B. from your AEG hitting the "firing pin" to launch the 108 rds B.B. at once. The RG108 also has a quick detach function. The package including the B.B. shower and a flash hider.
(this bb shower can us Green Gas only)