I consider this gun the "Famas, Jr."
It one of the more popular guns seen in the game. It has ok range, good fire rate, good reloading, and ok damage. It's not as powerful as the Famas but it's recoil significantly less than the Famas and prefer it as my "run 'n gun" gun. OwNeD uses this gun as his main and probably has the most experience with it.
I like to correlate the scavenger perk with it and as for attachments, I have the red dot sight on but I would think the extended mag would be more beneficial just havent tried it yet.