The scar-h is a very effective weapon in UWO. I myself prefer the .50 cal sniper rifle with suppressor. That really comes in handy when you're in the crow's nest and want to take out some NPCs without using your cannon ammunition.
Grenades and RPGs are also pretty handy when doing ghost grind.
FN FAL 'the right arm of the free world' I spent a couple of years sleeping next to one of them (1970s), it feels right and inspires confidence in the noobs. So if you can get the pirate in close std ball rounds should cause them problems, with armour piercing then even heavy iron plate would be of little protection. However when the 'you know what' hits the fan then your squad/fleets MAG and a couple of hundred rounds of link just rules. That Queen of the battlefield even cut trees/masts down.... Aah the good ol' days.
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Grenades and RPGs are also pretty handy when doing ghost grind.