He throws him down and fires a shot next to him, convincing Deitrich he killed him.
Sean Archer (John Travolta) uses a factory two-tone SIG-Sauer P226 with nickel controls and a nickel slide as his sidearm in the film, which has been fitted with a set of Hogue rubber grips.
Prison guards on the oil drill platform keep Beretta 92FS pistols as their sidearm.
When Sean Archer/Castor Troy (Nicolas Cage) escapes from the electroshock room, he takes a guards Beretta 92FS and uses it to fire on the guards, carefully placing his shots as not to kill them.
During the final shootout in the church, Castor Troy's girlfriend Sasha Hassler (Gina Gershon) is armed with a Smith & Wesson 3913.
She likely took it from one of Dietrich's (Nick Cassavetes) friends, who was killed while using it during the raid on his apartment.
When he and Castor Troy (Nicolas Cage) switch faces and identities, Archer/Troy begins using the weapon, killing Dietrich (Nick Cassavetes) and another FBI agent with it before he loses it during the funeral home's "Mexican Standoff".
SIG-Sauer P226 two-tone with nickel hammer - 9x19mm.
A Russian Stechkin APS machine pistol is used briefly by one of Dietrich's (Nick Cassavetes) friends to fire on police raiding the apartment building.
While in the courtyard of the funeral home, Castor Troy/Sean Archer (John Travolta) uses one briefly before having it knocked from his hand.
During the final firefight Archer/Troy uses a pair of Beretta92FS', wielding them akimbo as per the standard norm of John Woo films.
Jamie (Dominique Swain) picks one of these up as Archer/Troy and Troy/Archer (John Travolta) struggle in the church's courtyard, only to be misled into shooting her father in the arm.
Castor Troy/Sean Archer (John Travolta) tries to draw one, which he previously stole from an FBI agent, to use on Sean Archer/Castor Troy (Nicolas Cage) while on the speed boat, but Archer/Troy kicks it away before he can use it.