Bioware has messed up going live with N7 Day, apparently, so it's now live and extended to Friday.
You get one pack containing an ultra-rare and some unimportant consumables for free, and the special challenge is to extract three times with a human character.
I got the Particle Rifle in my pack and tried it out for the three extraction games on my human soldier. Fun gun (on Bronze, at least), and having infinite ammo is quite a boon, provided you manage to stop firing before you empty your magazine completely (as the rifle doesn't need the long reload animation then). If you do empty your magazine, a timely adrenaline rush even makes the gun regenerate without reloading, though using it while firing for a massive firepower increase obviously is the better option.
Still, even though it burns enemies to cinders like nothing, it doesn't quite have the "oomph" feeling of a real heavy assault rifle like the Revenant.