Shotgun could use a downgrade in range. It is pretty smoking hot at ranges where I would think it is no-joy for sure relative to other weapons. Whatever you did to the MP5 was just right! It was a bit OP there and now it is perfection; risk/reward. G36 is... not OP but if you decide to control your rate of fire it almost never misses at long range. Maybe a touch down on the G36 power as well.
A 7.62 NATO/308 rifle would be appropriate with all the other major military calibers being represented. Perhaps a M14/M1A type rifle which could bridge the gap between the sniper and the automatic weapons? I dont need too many different guns but it would only seem fitting that a 308 would be with the 7.62 WP and 5.56

FN FAL would be the logical choice for a 308 battle rifle as well.
I like the Inventory system alot. I think it could be speeded up so it instantly comes up instead of having to fly in from off screen. Also, the message box/text box needs to be clear and you guys find a font/color combo that you can see. When things are packed in a multiplayer room it is hard to play with that whole area of text attacking the NW position of the screen >.<
Wishlist items: Inventory system used for upgrades such as scopes, "Tacticool" items, and other mods and equipment. Gas/Smoke grenades or some type of obfuscation grenade. Mods and equipment that affect weapon accuracy and performance in positive and negative ways. 2 Weapons of Choice instead of a Weapon and a Shield/Rocket.
Great game btw! Best I have played in a while. Keep up the good work.