Well I could try to mod this one here

But I don't really know where to get the model
So if you could help me finding the model, maybe in the near future PKP Pecheneg as custom LMG in payday 2 might not sound so far fetched.

Preferably PKP from Call of Duty Modern Warfare 3.
As it incorrectly feed ammo from right
(So it could be modded in with base from M249)

Just putting it here.