Does a Rogue using one handed fire arm and the Flick of the Wrist feat (Races of the Wild, p. 150-151) allow him to use his Sneak Attack?
The Flick of the Wrist feat (Races of the Wild, p. 150-151) says:
If you draw a light weapon and make a melee attack with it in the same round, you catch your opponent flat-footed (for the purpose of this attack only). You can use this feat only once per round and once per opponent during any single combat encounter.
Only a melee attack qualifies for the flat-footed attack from flick of the wrist, and shooting a firearm is a ranged attack.