It mainly depends in the range you hit your target from.
Short range: 25~29
Middle range: 23~27
Long range: 19~23
The M16A2's sights are bulkier than the other Assault Rifles, and having similar sights to the M249 SAW, covering larger portion of the screen. Despite that, the iron sights are extremely well designed, allowing the user to line up targets more easily than the M16A2's counter part, the AEK-971 which is very poorly designed.
It's extremely effective from mid to long ranges due to the M16's 3 round Burst allowing it to fire the 3 rounds fast and accurate, without losing much deviation. This gun is somewhat disadvantageous in Close Quarter Combat due its limited burst, though it is still usable in this case provided the player is calm and accurate with the shots.
This weapon has 30 rounds Mag with another 60 rounds in reserve. This gun has a reload time of 4 seconds.
In real life, the weapon can also be fired in semi automatic mode. Also note that the M203 underbarrel grenade launcher visible on it is not usable. This is do to the Developers coping the design from Battlefield: Bad Company 2.