From Michael Z. Williamson: M4 Carbine Failures in Afghanistan Likely Due to High Rate of Fire

Dear Jim,

The alleged failure of M4s in Afghanistan is being discussed on my forum and others. The story so far seems to be that when troops fired enough rounds [in a very short period of time] to overheat the weapons, they jammed. This is true of any weapon. Of course, circumstances may dictate that this happen, but it is not a design defect. The M4 is a carbine, not a light machineguns. It’s akin to blaming the HMMWV for having bad armor, when it was designed as a light truck. This site has some details, and a link to the after-action report (AAR). – Michael Z. Williamson, SurvivalBlog Editor at Large