Alrighty then. You may want to get a copy of the military TM which is but a Google search away and you can read it for yourself.
Thanks Iraqgunz! I downloaded a copy. Great sourse of info... Here's a link.. http://www.archive.org/download/ArmyTechnicalManualforM16Rifle-Tm9-1005-249-23p/Manual-Tm9-1005-249-23p.pdf ;)