HLX4 SMG
It's HE-LICAL. Helical to the X. X meaning... XTREME!
HLX-4 SMG
And it's got that Quad Klip so that's where they got the 4 from in HLX-4. Lmao.
This strange device is a PDW believe it or not, using cylindrical magazines that magically have large capacities, oh wait theres the bizon, and that's pretty dope... Well what the hell, why don't we see this more? More scifi guns with more cylinder mags gimme gimme.
The gimmick of this gun being a trigger reset delay, maybe not as apparant in here as it was in BO3 because god damn was it punishing in BO3, but it's here too. The opposite principles of charge up now that I think about it.
Source
From Treyarch's Black Ops 3
All thanks to Kirloper's asset repo