My plat 1 build :
http://gw2skills.net/editor/?PawAQhrlFwkYgsNmJeeXnvKA-zZIPlGFBFMEqYCUyCQDDA
Rifle + Pistol/Dagger Deadeye SA:
+1, Decap, Single target damage pressure
Pressure key target, sneak for decap (abuse stealth from rifle+SA), do +1 but avoid chassing if shadowstep on cooldown.