Stopping power with the M16 is one hit one kill at reasonable ranges. Extreme ranges takes 2 bursts at most if they are lined up correctly.
also the m16 can be played on any map. I usually do the best with it on Crash, and Ambush. I usually use an M4 or AK in Chinatown because they are better in the buildings.
the map that I cannot stand playing is Overgrown.