It's the first ship in the game with 7 hit points (specifically, 4 hull, 3 shields). Previously, we would jump from 6 (Bomber, Defender, TIE/sf, T-70) to 8 (Y-Wing, B-Wing, Aggressor, G-1A, U-Wing). Weird, uh? With 46 non-Huge ships in the game, only one clocks at 7 life.
Why is it nicknamed Gunboat, by the way? I'm not familiar with the videogames, but in the Star Wars: Clone Wars series, a gunboat was a troop transport for the clones (EDIT: untrue, that's also a gunship). Wookieepedia confirms this use of the term for the similar "gunship", which also applies to the only instance of it in the game, the Auzituck Gunship. This one is a fighter, though. What gives?
Edited by Kumagoro