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.
Beretta 92FS
During the finale, one of the thugs working for Mr. Baek uses a Beretta 92FS pistol.
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.
Taurus Model 85
Sun-Woo's friend Min-gi is armed with what looks like a Taurus Model 85 at the beginning of the film. As it is not properly in focus, it could also be a Smith & Wesson Model 36 In the slightly altered Director's Cut, there is an extra scene not present in the theatrical version before Sun-Woo and Min-gi confront Baek's men where Min-gi is seen checking the revolver.
The Steyr SPP, mounted with a front grip and converted to automatic fire possibly 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. Another slightly modified Steyr SPP is used by one of Baek's thugs in the finale, but he is killed by the gun dealer's brother before he can ever fire it.
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.