When switching the weapon to the left shoulder, one can peek into the inserted magazine of any Katiba type Rifle and see that it contains conventional, brass 5.56 mm rounds.
It would be cool if the gun would receive a last makeover to make it look like it fires the advertised 6.8 (or 6.6, can´t tell with the font) caseless ammo. New Magazine, new Bolt, done n done.
However, this is not an important visual inconsistency, since you usually will not notice it unless specifically looking for it. {F21139}