Found this off the Gamefaqs board ~It does have a use!~
-Advising the Enemy (call Para-Medic after your first meeting with Ocelot)
Para-Medic: By the way, Snake.
Snake: What?
Para-Medic: What was that little lecture back there?
Snake: Lecture?
Para-Medic: You were instructing the GRU commander, weren't you? Something
about the first round, or his hand.
Snake: Yeah...
Para-Medic: What was that supposed to mean?
Snake: Mmm... Whenever he put a new clip in his gun he'd always load the first round by hand, whether there was a round left in the chamber or not. It's a
technique they teach in the Middle East. By making sure there's always a round
in the chamber, you eliminate the risk of pulling the trigger with nothing to
fire. He must have heard about it from someone, or read it somewhere... in any
case, he probably wanted to try it out for himself. And he was obviously
motivated by vanity to show off his new technique. That's when you make
mistakes. The battlefield is an unforgiving place. The only techniques you can
rely on are the ones you've mastered through experience and practice.
Para-Medic: Uh huh. And what were you saying about him being more suited to
revolver?
Snake: When he fired, he was bending his elbow sharply to avoid the recoil. It
looked like he wasn't aware he was doing it, but that habit can be either a
fatal flaw or a gift.
Para-Medic: What do you mean?
Snake: Automatic weapons use recoil to operate, so if you don't let the recoil
hit you, it interferes with the operating cycle of the gun. Basically, he
shouldn't be trying to avoid the impact like that. But with a revolver,
there's no need to let the recoil hit you. Just the opposite - avoiding the
recoil lets you reduce the strain on your hand and arm. That kid might just be
handy with a high-caliber revolver.
Para-Medic: Handy...? Are you listening to yourself?
Snake: What do you mean?
Para-Medic: He's the enemy! Why are you giving him advice?
Snake: I...
Para-Medic: Snake?
Snake: ...I don't know. For some reason, I couldn't help but point it out to
him...
Snake: ...Snake, are you alright?
Snake: ...Yeah...
