[IronDuke99]

In my opinion SF machine guns, manned by good troops, should be able to mostly stop leg infantry movement, in good visibility and in open terrain, at about 400 yards at the very least, ie, infantry should go to ground and pretty much not be able to get forward without cover, until the SF MG is taken out. Bear in mind that most assault rifles are total rubbish at much beyond 300 yards, and that they are also weaker at penetrating cover than rounds like the 7.62mm NATO or older .303 British. (The main reason the British reintroduced a 7.62mm rifle for limited issue to infantry platoons a few years back).

I will also stick to what I said originally; all gunship helicopters should be better at killing, and routing, leg infantry than they are now, especially less well trained forces lacking much in the way of air defence. With earlier, medium and heavy MG armed helicopters, lacking advanced sighting systems, this should naturally only apply in fairly open terrain.