Do NOT waste the money you get when it's awarded to you. All new characters get one month gun periods and money when they get so many kills. Upgrades are expensive, only buy them when you use a gun you can work like your hand.
It will let you try out a few guns for the one-two month period. Get used to those, but more importantly get used to the basic M16.
EF2000-WT is a good gun for a bullpup, and is almost equal to the golden assault rifle. EF2000 is perfect for attempting to semi-auto snipe--the gun is that friendly.
I don't know what other guns it will give you, as I got the contest over and done with back in closed beta.