The bulk of the AD's (accidental discharges) we had when I was in Iraq in 2003 was because the soldier improperly cleared the weapon and left a round in the chamber after they dropped the magazine
@txradioguy I saw this happen when one of the regular army soldiers assigned to help SF Training Group by posing as untrained guerillas for the Robin Sage operations showed up without a M-16. He was going out on an ambush,so I lent him my FN-FAL,and damned if he didn't have an AD with it before they even got out of the base camp. It was,of course,loaded with blanks.