Photoshopped mock-up of "Vulkan M2 Tactical prototype" - 5.45x39mm. There is no evidence that a gun of this configuration exists in reality.
Discussion
More than a AK reminds me of a Tavor (stock), which is also in Ukrainian military. The one in the photo is a recent version or the 2005 prototype?--Dannyguns (talk) 04:21, 9 January 2019 (EST)