The G11, in reality, was a non-production prototype assault rifle, constructed by Heckler & Koch. It is powered by electricity and fires caseless ammunition. Heckler & Koch fully completed the G11 in 1990, however, the assualt rifle still wasn't put in production due to the German reunification and lack of procurement contract. Only 1000 units were ever produced.
Only available from the Mystery Box, the G11 comes with its Low Power Scope. Because of its sway and low power, many players look down upon it and usually trade it for another weapon. It can be used with effectiveness up until round 15, if going for headshots, where the player may want to Pack-a-Punch it.
After being Pack-a-Punched, the G11 becomes the "G115 Generator", gaining more power, ammuntion, a full auto upgrade, and the scope has no sway if the player zooms in. Its full auto capability really improves its power, which makes killing zombies easier until about round 25. Despite its high ammunition count, using the G11 carelessly may leave the player with an empty weapon.