In the interest of balance in some custom games, I hope someone out there takes note.
There is a bug I noticed in Halo 4 multiplayer matches;
The assault rifle, at a very light tap of the trigger, deals out the same damage as a single headshot from a DMR.
The result is that the auto rifle can put out more damage per second than every and any precision weapon because of its rate of fire. Coupling that with a pretty significant range and tight spread, there is no point to using anything besides the auto rifle in Halo 4 matches.