The Sniper (2009) (Chinese)

AKA: Sun cheung sau
Directed: Dante Lam
Genre: Action | Adventure | Crime | Drama | Thriller
Country: Hong Kong
Language: Cantonese | Hokkien
Plot: A police sniper teams up with a hot-headed rookie to take down his former friend and teammate, who is exacting revenge on the police force.

http://www.imdb.com/title/tt1194624/
http://www.lovehkfilm.com/reviews_2/sniper.html
http://en.wikipedia.org/wiki/The_Sniper_(2009_film)