As phanatic noted, the thing has been debunked thoroughly. Every single weapon mentioned has incorrect information somewhere.

6lb body armor? Try 26lb.

M243? No such thing, it's the M-249 and it is a wonderful weapon which I carried downrange for about six months. Love it to death.

M14 is not being issued in bulk, nor modified with kevlar stocks.

Shotguns--wrong model, and they are for breaching, not room clearing. Clearing rooms with shotguns leads to dead noncombatants.

Barretts are used for EOD, primarily.

M-240 is nothing more than an FN MAG. They are issued in several versions, from helicoptor door guns to coax and loader MGs on tanks, to standard GPMG bipod and shoulder stock configurations in infantry platoons.

Marines wouldn't have an experience with M-4s, they never adopted them.

M-16A4s do NOT have a jamming problem if you clean your damn weapons. I also didn't have any problem dropping insurgents. Or dogs, for that matter.

And no one is conducting "random autopsies" on insurgents.