My friend used a fusion to get there and I did it with a sniper rifle. The big one is that I think assists still count or at least it seemed like it. Either way it took patience and planning, but in the end was not as hard as it sounds. If you position yourself and play defensively you can get through with at least a 1:1 KDR and be good in a couple of hours. At first I struggled with a void sniper because I hate sniping but again it just takes planning and patience to find places off the beaten path to shoot from. As well, dont forget some class skills are void like the defenders punch and grenade. It also helps to make a real effort to get the heavy ammo drops. Good luck, it was at times frustrating, but my friend and I both did it. Neither of us are real pvp machines. We just took it slow and planned it out.