Certainly NOT real, no way any professional soldier would wear a beret that badly shaped....unless you are a Yank of course.
It's a still from the TV series "Z Nation" I was just curious as I know the G5 isn't an exact replica of any real firearm...and obviously this looks a lot like it.
@DrAlexanderTobacco the ejection port in the pic seems a tad high for a bren? although hard to tell with the photo quality.