FNR-5 "Annihilator+ultra" (2x UAC10, 2x UAC5, ECM, STD 300)

I've gotten a few 1k plus damage games in this, tend to average around 800 damage per match.

 

Cooler version by sacrifing a bit of speed (STD295) and some armor (no issues on the arm though: it's a really small target that never get focused)

Cooler AC5 version to prevent jams and have at least one weapon group capable of permafiring