You also have to account for the scaling effect. These pirates are not actually... proficient weapons expert. Even the privateers []
You also have to account for the scaling effect. These pirates are not actually... proficient weapons expert. Even the privateers aren't Marine material. These people probably picked up a gun in there early twenties to late thirties. As far as training? They probably just shot some targets every now and then. Pirates don't actually have seemingly unlimited bullets like US soldiers. Even successful pirates/privateers have very limited ammo compared to real soldiers. Also, Jason Brody normally sucks at using weapons, however over time he gets better. this is akin to unlocking the skills. It's assumed that Brody's practice is making him better.
I love how people assume that you need weapons training to be a deadly killing machine. You really don't. Kids have gone to school and mowed down entire classrooms before (Tragically). You ever see the instructions for a grenade? Pretty easy, seeing as I could actually buy one for 50 bucks within a day (Not legally of course). Squeeze grenade, pull pin, throw... C4: Place, run, push button. RPG?: Aim, shoot. Sniper?: Aim, allow for distance, shoot. Calibration isn't as difficult as you might assume. I've calibrated scopes for a BB gun, which is, in principal, the same thing. Shoot, calibrate, shoot again, calibrate. Rinse and repeat.
(Accidently cut this post off from the last one, this was supposed to be first, then the post below (if viewing from newest first) was suppose to be right after it.)