Bandit LOAF
Long Live the Confederation!
There are certainly 'in-fiction' weapons which don't appear simulated in the games... but an AMG on the frigate isn't one of them. (People familiar with frigates in the modern setting won't quite appreciate how they work in Wing Commander -- they're not really light line warships in WC as much as they are larger, modular ships dedicated to carrying expendable weaponry or acting as transports/command centers for higher value payloads).