The M16A2 (M16A1E1) was tested at Aberdeen Proving Ground in 82 and report issued in l983 identifying a "catastrophic" design problem with the case ejection. http://www.highpowerforum.com/PDF/M16A1 ... 0APG-1.pdf The report has been published to the internet above. Takes a while to download but a worthwhile read. I have been told by reliable sources that several have been killed/wounded as a result of hot brass going down the neck of shooter next to them and in the involuntary reaction to being burned, lost control of muzzle and shot soldier on next firing point. I am also aware the test report was altered after the author signed off on it without his knowledge. Finally I am aware the Inspector General of the Marine Corps, and the Criminal Investigation Division of the Army have been advised by persons closely involved in that testing the document was altered and the problem covered up. If anyone is aware of anyone being accidently shot or killed as a result of hot brass they should contact Army CID Aberdeen Proving Ground or Inspector General Marine Corps.