This is a pre-built fully functional Proton Pack, the only issue with it is that the jar is stuck to the Proton Pack so you won’t be able to remove it. The Proton Pack is a custom designed, 3D printed hopper feed that allows for 20+ rounds per second and is compatible with a 3S Jupiter. You can use any Rival ammo, including 3rd party ammo, and cheap knock-off rounds. Ammo is not included.
