The M16A2 is a moderately powerful assault rifle which can be found in all military loot spawns. It can kill a zombie with two shots to the body. A version with an attached grenade launcher, the M16A2 M203, is also available.
Compared to it's equivalent in availability, the AK-74, the main advantages are the slim aiming post which allows a clear view of the target and the ability to use subsonic rounds. The ammunition, 30Rnd. STANAG SD and 30Rnd. STANAG, is comparatively more common, because the standard magazine spawns with the same chance as the 30Rnd. AK, plus a more uncommon SD mag.