Early days of the M16 in combat
Major Culver, founder of the CSP Forum, was involved in the Viet Nam M16 'fix' and it is documented here:
Welcome to Culver's Shooting Page
and here
Welcome to Culver's Shooting Page
includes why McNamara's military industrial complex forsook the 30 cal, and the unknown changes to the ammo that precipitated the jamming problem, and an old marine armorer who took care of his troops with unauthorized field repair, and the eventual final fix after many unnecessary deaths.
Good read, I've saved it to offline so if a website goes down I'll have it.
---------- Post added at 10:06 AM ---------- Previous post was at 09:58 AM ----------
I actually posted the web link but when I submitted the reply it only took the forum address.
If you click on the address, in the header at the top of the page, go to the "Saga of the M16" which is where this is found.
or
in the url type http://www. then jouster2.com/Sagaof16Part1.html and jouster2.com/Sagaof16Part2.html