I personally went with the silenced sniper (second one i think?), the silenced SMG (unlocked from getting a bunch of relics i think) or pistol, for the third slot it depended, sometimes i took the rpg/grenade launcher, sometimes i took the 50 cal sniper. As for the forth slot i generally went with the bow, though other guns would most likely be better, but nothing beats the bow in terms of fun
Can't remember the weapon names, i'll check later on.
1. M700 Silenced Sniper
2. Shadow (Silenced pistol) or Shredder (Silenced SMG, basically a Vector but better)
3. Rpg/Grenade launcher or AMR (50 cal, basically a better Z93).
4. Bow