Squad model is missing the metal plate that is covering part of the ammo belt, on the left side here: https://youtu.be/1xbSNHEqh-g?t=505
Squad models are missing lots of things.
Most examples I've seen don't include that part. Seems like something that is specific to a certain model or is something that was usually removed.
Soviet ones will have a dust cover there.
Out of all the terribly inaccurate models squad has, this is one of the most plausible ones(that the RPD is the Chinese version, which is entirely plausible for any middle eastern...etc. setting).