Step 1. Leave last word unequipped, and have something else in your primary slot. Step 2. Wait until heavy procs, grab heavy, go to safe spot. Step 3. Go into inventory and put last word into you primary slot. Step 3. Play conservatively with a high impact machine gun (jolders hammer) and get a few kills with it. Step 4. When heavy runs out, go back into inventory and take last word out of your primary slot. Kills with ANY weapon count as long as the last word is in your primary slot. As soon as you take the last word out of your primary slot you can die as much as you want and the quest progress WILL NOT reset. Do this for a handful of matches and your rep for the quest should steadily rise.