I almost always go Thompsons and a BAR for the the 3rd slot. The lone BAR still buffs their mid-range damage and the mid-range damage on Thompsons isn't half bad. Main reason I do this is that Thompsons are way more wipey in my experience and give you a better chance to get a wipe if your opponent's attention is elsewhere and you can close distance. It's also cheaper munitions wise.
