The M4 suffered more stoppages than the combined number of jams by the three other competitors the Heckler & Koch XM8, FNH USAs Special Operations Forces Combat Assault Rifle (SCAR) and the H&K 416.
Follow the money. Polticians, defense contractors, and military officers are lining their pockets. Idiocy like this can always be explained if you just follow the money. I hope somebody with more resources than me - - and somebody who cannot be purchased - - will do so.