Also, point: In order to keep overall balance, the HMG will need to be adjusted along with the rifles.

If these changes were to be put into effect, the HMG range needs to be dropped to "close" status. HMG's dispersion is not enough to reduce it's effectiveness at "short" range. Assault variant rifles should be able to out DPS an HMG at the edge of it's optimal, and it can't do that when after 1 second of firing the HMG's spread has shrunk enough to hit you with almost every bullet. That, or instead of getting a tighter spread the longer it fires, it should get wider the more you shoot (as any person thinking about it logically would have made it from the start) making it less effective at range unless you fire in bursts. Also, if this happens, the time it takes for the circular crosshairs to change from full size to normal size should be around 2 seconds and the crosshair should start at about half it's current size to allow for expansion.