Johngabriel is right,pandariawise other than the pvp conquest malevolent gladiator bows/guns most of the other bows guns come from the herioc stormstout brewery,heroic terrace of endless spring etc,there's about 26 bows/crossbows and guns all in all,from ilevel 404 up to 509.
This just happens to one that you can get from a rare mob,and probably a footstep up the ladder from the cata gear..