Like eldequello said, this has been around for years.

I carried the M-16 around in the first gulf war as well. When the ground assault started, it was raining!! The moisture kept the dust and dirt down to a minimum and I had no jam-ups at all. I was very anal about keeping my toy gun clean, and only experienced one jam on the range over there, slamming the forward assist took care of it. As far as the 5.56 for a killing cartridge, a 3 round burst to the chest puts the bad guys down every time.