Dumped everything to FA to take advantage of the damage bonus for every 3000 firearms offered by the set bonus. M700C with the "god roll" talents (Destructive/Disciplined/Elevated) as primary. Using a mix of mods to enhance crit/HSD. Another talent is Prepared and I wish I could have rolled off Elevated.
Any weapon will do as a secondary.
This build is great for teamwork during missions with long sight lines/elevated. The main problem for HF is sustain, but if you are careful, you can solo most activities in the game. Defilibrator for reviving teammates. Can be replaced with any other healing skill for soloing.