The following weapons were used in the film A Bittersweet Life:
Stechkin APS
Sun-Woo (Byung-hun Lee) uses a Stechkin APS pistol for much of the latter half of the film, stealing it from a weapons dealer who claims it is the "finest gun manufactured in Russia". Although the Stechkin is select fire, Sun-Woo only fires it in semi-automatic.
Smith & Wesson Model 40
Moo-Sung is armed with a Smith & Wesson Centennial revolver during the finale. Another of Baek's thugs is seen loading one by spinning the cylinder and flicking his wrist to the right in order to push the cylinder back into place.
Beretta 92FS
During the finale, one of the thugs working for Mr. Baek uses a Beretta 92FS pistol.
The Steyr SPP, mounted with a front grip and converted to automatic fire to give the appearance of a Steyr TMP, is used by the arms dealer Myung-Gu before Sun-Woo kills him, taking the gun for himself and using it for the rest of the film.
Norinco Type 56-1
Two thugs working for the mobster Mr. Baek use Norinco Type 56-1 rifles during the finale, firing them wildly at Sun-Woo before they are killed.