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 Centennial
A Smith & Wesson Centennial revolver is used by Mr. Baek's enforcer Oh Mu-Sung (Lee Gi-yeong) in the finale.
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.