Pros:
20% Faster Firing Speed
60% Larger Clip Size
+100% Secondary Ammo
35% Faster Reload Time

Cons:
-25% Damage Penalty
Mini-crits when it'd normally crit
Bumrush: Once drawn, cannot put away until you successfully kill someone. (Alternative ways: 1. Waste your ammo. 2. Go to a resupply cabinet. Wasting your ammo will leave you with none, so you'd need more, and it'd take a bit to replenish it. Besides, in order to reload, you'd have to re-activate the bumrush.)

Neutral:
When fighting someone else with either of the weapons in this set, you take 25% more damage from that weapon, but also deal 25% more damage back.

How to use it:
It's more of a close combat of weapon, like the smg should be, except, it fires a lot faster than the stock smg with 40 shots per clip, 150 on reserve, dealing less damage per hit, or, if you are dealing with a market gardening soldier and you only get one shot in with the rifle, which'll leave him with very little hp, this is the perfect finisher, with the soldier having slow attack speed, you can easily take that to your advantage, and using your attack speed to finish him off quickly. Unfortunately, when you draw this weapon, your Free-to-Play side comes to you and you become determined to kill someone with it before switching weapons again. When other snipers decide to use one of these weapons, as well, and try to stop your teammates, you can take advantage of them being distracted by your teammates and use this weapon to ignore the damage penalty and take them out quickly, but you better do it before they do to you, because that also works against you.