Four Brothers is a 2005 drama starring Mark Wahlberg, Tyrese Gibson, André Benjamin and Garrett Hedlund as four foster brothers who come together in the midst of a tragedy involving their foster mother. The film was directed by John Singleton and was loosely adapted from the 1965 John Wayne film The Sons of Katie Elder.
The following weapons were used in the film Four Brothers:
Colt MK IV Series 70
A nickel Colt MK IV Series 70 is the handgun carried by Bobby (Mark Wahlberg), which he hands off to Angel (Tyrese Gibson) from the trunk of his car during a scene of trying to get information about their mother's killers. Bobby later uses it to shoot at Damian's dogs and then at Damian as he escapes. Bobby also uses the pistol to execute one of his mother's killers after the car chase scene.
Desert Eagle Mark I
One of Victor Sweet's thugs produces a custom ported and nickel-plated Desert Eagle Mark I (judging by the teardrop-shaped safety lever) and fires a shot into Jack's shoulder, wounding him. Bobby (Mark Wahlberg) then picks up this same gun off the ground after the gunfight and shoots another thug pointblank after getting information out of him. The same gun can be seen in The Big Hit (ironically, another movie that starred Mark Wahlberg).
Desert Eagle "Non Gun"
When Bobby kills the van driver, the Desert Eagle he uses changes to a "Non Gun" Desert Eagle.
One of the guns that Bobby (Mark Wahlberg) retrieves from the shooters' apartment is a Beretta 93R with the fore grip and flash hider removed. This appears to be the exact same weapon that Mark Wahlberg previously used in The Big Hit, and its appearance in the movie is likely a reference to Wahlberg's appearance in that film. (Both The Big Hit and Four Brothers acquired their weapons from the same armorer - John "Frenchie" Berger.)
Beretta 92FS Inox
Detective Fowler (Josh Charles) uses a Glock 17 as his issued sidearm and draws it when there's a knock at the door in one scene. Angel (Tyrese Gibson) obtains it from Fowler and holds him at gunpoint, Fowler then retrieves the pistol again and holds Angel hostage, then fires shots at the Detroit police before being shot.
Glock "Non Gun"
What appears to be a "Non Gun" Glock can be seen in Fowler's hand after he is shot by a sniper.
Heckler & Koch Mark 23
When Bobby lifts the Mattress to reveal the shooter's arsenal, a Heckler & Koch Mark 23 can be seen. The H&K Mark 23 is taken by Bobby.
Heckler & Koch USP
Damian (Lyriq Bent) retrieves a Ruger KP90 from his apartment when the Mercer brothers come banging on his door. He then fires a few shots at them when attempting to escape. Angel (Tyrese Gibson) then uses this pistol throughout the rest of the movie, specifically during the car chase scene.
SIG-Sauer P220 Sport
One of the weapons that Bobby takes from the shooter's apartment is a SIG-Sauer P220 Sport which Angel later uses in the home shootout, and one of Victor Sweet's men can be see with one just before the meeting.
Smith & Wesson Model 19 (nickel)
What appears to be a nickel Smith & Wesson Model 19 is seen amongst the various guns Bobby (Mark Wahlberg) ransacks from the shooters home, he aims it at Jerry when he arrives at the Mercer home suddenly unannounced while he and Jack sort through the ransacked guns.
Smith & Wesson Model 60 (Bobbed Hammer)
Smith & Wesson Model 66
When Bobby lifts the mattress to reveal the shooter's arsenal, a Smith & Wesson Model 66 can be seen.
Smith & Wesson Model 36
When Bobby lifts the mattress to reveal the shooter's arsenal, a pair of small frame snub nose revolvers that resemble the Smith & Wesson Model 36 are seen.
A Remington 870 is used by the robbers at the beginning to kill the store owner and Evelyn Mercer (Fionnula Flanagan). Bobby (Mark Wahlberg) also uses a pistol gripped Remington 870 throughout much of the movie, and briefly used by Jack (Garrett Hedlund) as the shooters escape in their car. In a continuity error, Bobby's Mossberg changes to the 870 during the house shootout, seen below.
Mossberg 500 Cruiser
Bobby (Mark Wahlberg) finds a Mossberg 500 Cruiser (the pistol gripped version of the Mossberg 500) in the shooters' apartment. Bobby uses this shotgun specifically in the Mercer home shootout scene to kill multiple thugs. In a continuity error, the gun changes to the Remington 870 above during the shootout. This can be seen in the above screencap of Bobby blind firing the 870 during the shootout, when it was a Mossberg just moments earlier.
Heckler & Koch G36C
A couple of Victor Sweet's hoodlums use Heckler & Koch G36Cs in an attempted hit on the Mercer brothers in their mother's home, one of them fitted with a G36E-esque carry handle/sight assembly.
Heckler & Koch HK33A2
A SWAT team member uses a Heckler & Koch HK33A2 with scope and bi-pod to shoot and kill a crazed Detective Fowler (Josh Charles). It appears to be fitted with the 30 round magazine that was introduced with the HK93 civilian rifle.
Steyr AUG A1
At least one of Victor Sweet's hoodlums use a Steyr AUG A1 with a 16" barrel in an attempted hit on the Mercer brothers in their mother's home.
M16 / SP1 (Mocked up as M16A2)
At a funeral, police officers in the honor guard can be seen firing M16 (SP1) rifles mocked up to resemble M16A2s - they are fitted with heavy A2-style barrels as well as A2-style handguards, and feature 20 round magazines.
Remington Model 700PSS
Just before the police go to Fowler's house, a SWAT officer can be seen with a Remington Model 700PSS slung over his shoulder.
Heckler & Koch MP5A5
Heckler & Koch MP5K
At least one of Victor Sweet's hoodlums uses a Heckler & Koch MP5K in an attempted hit on the Mercer brothers in their mother's home.