The following guns were used in the film Oldboy:
Police officers in the beginning of the movie have unknown handguns in their holsters.
A pistol in a police officers holster.
Remington 1866 Derringer
Woo-jin Lee (Ji-tae Yu) uses this derringer at the end of the movie.
Remington 1866 Derringer - .41 RF Short.
Woo-jin Lee inspects the derringer before wrapping it back up in paper.
Woo-jin Lee holds the derringer on Dae-su Oh (Choi Min-sik
) at the end of the movie.