Early on you can run out of assault rifle ammo pretty quick using the FS1, this is why i spent the first hour or two improving my ammo pouch. I like burst fire weapons better than semi-auto, so it's my favorite gun at the moment. Just need to manage your ammo. It's not a gun you wanna spray and pray with.
Silenced Single Shot Assault Rifle with the scope Silenced Mp5 with a reflex scope or a Silenced bolt action sniper rifle the better of the 2 LMGs with a red dot for when stealth isn't possible or for big game. --- "Please leave the room if this will offend you"- Budd Dwyer,
I personally only pick weapons that can be silenced, Short= The MP5 w/ silencer & red dot,(or vector when I get it), Long= the M-700 with HPS, Hunting= Recurve Bow, and for when my covers blown and need to cause Chaos= I use the GL-94