I'm currently a lvl 31 gunslinger and usually when I'm not in cover (chasing someone - pvp) my attacks that I use so far are Flurry of Bolts and Quick Shot (if my Leg Shot is on cooldown). Is it appropriate?
Any more suggestions for when I'm not in cover?
NB: For Snipers, those abilities are Rifle Shot and Overload Shot.
Answer: Mostly I use any debuffs that aren't on cooldown. Think about adding Flash Bang / Flash Grenade. These are AoE 8-second stuns with a 30m range and can give you time to set up in cover again. You can use Takedown / Quickdraw as well (these finishers can be used out of cover). If someone runs away, I usually pick a different target in range. I consider making someone run away as "mission accomplished."
A funny trick is putting an Explosive Probe / Sabotage Charge on someone right before they run away (most people run between 40-30% health) and then detonating it with Overload Shot / Quick Shot or Rifle Shot / Flurry of Bolts and finishing them off.