User blog comment:USMC Lance/Whats the better rifle: M16 or AK47?/@comment-4506250-20111014115433/@comment-76.252.29.21-20111015125850

Actually, no. The biggest issue in Vietnam was the ammo we used. It was the improper grain and caused excessive jamming. However, the gas system is indeed botched. Rather than add a piston, like practically every other rifle has, Stoner decided to use direct impingement. This is flawed in that it causes fouling of the chamber back, thus causing jams with the bolt as opposed to the casing.