I agree my kit list is the best case scenario. I guess I would say that would be official issue not actual issue
as for carrying different weapons. One could set up a sniper or long range shooting unit this way and its not a bad idea especially for urban enviroments.
The reason I chose carbines is they are lighter and easier to carry when slung and would be great when dismounted. But they could be equipped with any small arm that could be readily carried.