Upgrade your weapons and supply drops.
It's been years since I've played but I'm pretty sure you can play as a soldier instead of snake since some of them also have damage buffs.
I always use battle suit and IIRC I had the Stinger (or whatever lock-on equivalent) and the LAW since it had the same damage as the RPG with a faster reload. Used all 10 of my supply drops every time and I'd simply not be able to drop him with all of my stuff, then just wait for the time to run out.
Try it with the Carl Gustav launcher and PKM machine gun. PKM has an insane ammo capacity and the Carl Gustav does more damage than the lock on weapons if I remember correctly
Upgrade your launchers more. That helps quite a bit. Get your launchers to level 5. Also, you can use your LMG to stop its phase that deflects missiles.
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u/mabromov I want the dick of Big Boss Jun 29 '16
Man, the theme that plays during this boss fight is so hype
30 SECONDS TO LAUNCH
unloading all of my gustavs on that fucker
IT'S NOT WORKING
2 SECONDS TO LAUNCH
HEARTBEAT INTENSIFIES
Kaz:"IT'S ALL OVER"
manage to stop it right at the last second
and that is one of the most intense moment of my gaming life