G11 Blue Skull is a variant of the H&K G11.
Overview[]
It features a new Blue Skull skin with enhanced accuracy and firepower - unlike the M1216 Blue Skull, however, this gun does not receive upgraded ammo capacity, most likely to balance gameplay because the G11 already has a very large clip.
In all CF version, this gun is available in Reward Crates (Thunder Tower crystal safes and Giant Predator boss crates).