My biggest problem with the Rainforest is that it's stats are pretty much everything a Carbine isn't. Since they are usually rifles with shorter barrels, sometimes even using pistol ammo, they should have a shorter effective range, be less accurate, have less penetration, and this Carbine is just not.. not any of it. It's better than pretty much all assault rifles, and most of the snipers.
They make note of the large caliber round, and short barrel.. okay, so large caliber round, I can see it remaining high damage, but it should have SMG range at best in my opinion, and maybe an accuracy of 3 or 4. High damage if it hits, but low accuracy makes it a little easier to dodge.