Definitely not a V6F PAM661, which is the well-known factory version and was reviewed by PolonusTM when it came out. The lugs on the KW are a dead giveaway. It shows that the case used is the old case, hence it is thicker than the gen. The V6F on the other hand clearly has the same lugs (and the same midcase) as the gen.
The one in the video of the KW shows shorter and stubbier lugs compared to the longer ones on the V6F (and the gen).