The HGUP Model 66 is an obscure private project to produce a lightweight assault rifle firing caseless .223 cartridges in a compact, bullpup package. Though not much is known about this weapon, it has been observed in the hands of US Navy SEALS and the CIA's SOG in Vietnam and in Oceanyka. Eastern intelligence does not believe it to be an easily mass-produced weapon, likely using cutting-edge mechanisms, alloys and polymers.

HGUP Model 66
Assault Rifle