Connor (Sean Patrick Flanery) and Murphy (Norman Reedus) McManus use pairs of sound suppressed Beretta 92FS pistols when killing various criminals in the film. They also give David Della Rocco (David Della Rocco) a pair of Berettas when they recruit him to their team.
Taurus PT92
Due to a continuity error, the MacManus brothers' Beretta 92FS pistols become Brazilian-made Taurus PT92s in several scenes. They are distinguished by their frame mounted slide stop safety instead of the slide mounted decocking safety found on the Beretta. The assassin (name?) also uses a pair of stainless sound suppressed PT92s to kill the family in the flashback as Rocco explains why they should kill him.
Il Duce (Billy Connolly) also uses a stainless PT92 when facing off with the brothers and Rocco outside the house.
Colt Python
David Della Rocco (David Della Rocco) carries a snub nosed Colt Python with a stainless finish and most notabley uses it to kill the three men in the diner. Some people are inclined to believe Rocco uses a Colt Diamondback instead of a Python because Det. Greenley (Bob Marley) claims they recovered .38 slugs at the crime scene. One should note that a .357 Magnum and a .38 Special round are dimensionally exact in diameter (but not length), so the bullet head would be .38 regardless of which round was used.
Papa Joe Yakavetta (Carlo Rota) also uses a Colt Python, his with a blued finish and a 6" barrel later in the film. Some people claim it is a Colt Anaconda do to its seemingly large size, yet the Anaconda was never released in blue finish, only stainless steel.
Desert Eagle
Ivan Checkov (Scott Griffith) and his partner both carry custom Desert Eagles, his a Mark VII and his partner's a Mark XIX. They appear to be built up from both Chrome and Black finish models, with some features gold plated. Det. Paul Smecker (Willem Dafoe) refers to the bullets found at the scene as being ".50 caliber", yet the guns used are actually .44 Magnum.
Glock 26
While summing up the shootout in front of the house, Agent Paul Smecker (Willem Dafoe) fires his Glock 26 pistol into the air, which is something a real FBI Agent would never do.
Is it just me or is the diameter of the left gun bigger than the right. If so, it could be a 629 snub instead. Input? - Gunmaster45
Agreed, it does look a little bigger. .44? The Winchester
Smith & Wesson Model 686 Snub
Il Duce (Billy Connolly) wields a Smith & Wesson Model 686 Snub as one of his six guns during the shootout outside the house. A thug in Papa Joe Yakavetta's (Carlo Rota) house is also seen using one.
Il Duce (Billy Connolly) uses a Smith & Wesson 5906 as one of his six guns during the shootout outside the house. A thug during the poker game is also seen using one.
Franchi PA3/215
Il Duce (Billy Connolly) uses a Franchi PA3/215 with the stock removed during the final scene in the courthouse when he and the brothers execute Papa Joe Yakavetta (Carlo Rota).
Walther P5 Compact
Agent Paul Smecker (Willem Dafoe) uses a Walther P5 Compact fitted with a suppressor while dressed in drag to kill men in Papa Joe Yakavetta's (Carlo Rota) house in an attempt to save the brothers. It features gold plated parts and could possibley be the same gun used by Claire Danes used in Romeo + Juliet.