Whilst designated as Thunder HTs-14 by Hephaestus Custom, everybody will call this the OC-14 "Groza" ("Thunderstorm") as it is indeed patterned after the bullpup AK even the number and name designation will give you an idea. The video shows it being test fired and since this is in cooperation with GHK airsoft, this got the pedigree of the hard-kick gas blowbacks from GHK.