well, i wont argue regarding the EA game, but i can tell you this: ive fired a AK5 on a number of occasions, field-stripped it and performed weapons maintenance on said weapon more than “once or twice”.
I do have an eye for details, albeit not a good one…
So i can tell you this: the GenZero AG5 (automatgevär5) is very close to the real-life AK5(automatkarbin5) witch in turn is quite similar to the original design; FN FNC.
And when i say “very close to”, i mean: i cant spot a single difference (between the AG and AK). (except graphics, the green fluorescent sights are not what i remember from the actual weapon, no nightglowing sights on “my” weapon.)
So if two competent 3d modellers were to make their own rendering of the weapon, i think pretty much nobody would be able to tell the two weapons apart.
Considering the similarities between the AK5 and the FN FNC and the camera angle in relation to the weapon, i cant say with any level of certainty that the EA weapon is NOT a FN FNC.
On top of the argument above, remember that EA is a pretty big studio, with their own 3d designers and so on.
Its not impossible(in fact quite likely) that they would borrow their own graphical elements from their other games for a “mock-up” like the image you posted, but i find it borderline impossible that they would actually consider “borrowing” other companies intellectual property (IP).
As a unrelated curiosity, the FN FNC implemented a number of “features” that were borrowed and improved upon from other weapons, the AK47 and M16 to mention a few.
According to legend, a M16 magazine will fit the FNC & AK5.