MW2 Unlimited ammo update
The bug, spotted by increasing numbers of gamers on forums , breaks ammo counters and in some cases removes them entirely, which means UNLIMITED AMMO.!!
Robert Bowling, which is the developers community liason stated the following this morning. "Yes, it'll be eliminated soon enough"
Apparently, this originates from modded consoles, but can spread to non-tampered machines while playing online. The bug manifests differently for morally correct gamers, however, they will have to reboot their machine and clear the cache to rid themselves of the glitch.
So, just prepare for another update!!