Last night, I got the FAL to the level it needed to be so that I could use select fire. And it was awesome. The fire rate on it is pretty slow on full auto, but it is much better than trying to spam the left click button on semi auto. The best part is that on Hardcore, it rifle essentally kills in one it. Basically a fully auto sniper rifle.
I ended up having a couple of my best games last night where I had close to 30 kills and around 10ish deaths. I never get near 30 kills in a match usually, especially with the score ending at 75.
Overall, I quite like this weapon. Now I think I am going to have to unlock it with my next prestige so I can use it all the way through the level.