Nick Hume (Kevin Bacon) chooses a double-barrel .12 gauge Rossi Overland shotgun as his primary weapon in his mission against Darley's gang for revenge. The Rossi Overland is typically seen with 20 inch barrels, this is the 26 inch barrel variant.
Mossberg 500
A couple of 12 Gauge Mossberg 500 Persuader shotguns can be seen in the hands of Billy Darley (Garrett Hedlund) and another gang member in the murder scene at the gas station, it is used by Billy to blow away the clerk when he goes for his .38 Smith & Wesson Model 64 revolver. It can also be seen in the hands of Jamie (Dennis Keiffer) in the battle inside "the office".
Remington 870
A sawed-off pistol gripped Remington 870 shotgun can be seen in the raid on the Hume residence in the hands of Baggy (Kanin J. Howell) and again in the scene at "The Office" near the end shortly before Nick kills him with his Rossi Overland shotgun.
M1911A1
Nick Hume (Kevin Bacon) decides on an M1911A1 pistol as his main sidearm after purchasing it from Bones (John Goodman). The M1911A1 can also be seen in the hands of the gang member known as Tommy (Freddy Bouciegues) who fires it multiple times at Nick before being killed in the parking garage scene with the M1911A1.
Colt Python
Nick Hume (Kevin Bacon) opts for a .357 Magnum Colt Python revolver with the 6 inch barrel and nickel finish as one of the two handguns he buys. He uses it to execute Billy Darley & Hecto.
Magnum Research Inc. Mark VII Desert Eagle
Bones Darley (John Goodman) recommends that Nick Hume (Kevin Bacon) consider the Desert Eagle for his vigilante needs. He refers to the Desert Eagle as the "sword of justice" and the "king of mayhem." Nick opts for a .357 magnum Colt Python revolver, an M1911A1 and a long 12-gauge Rossi Overland shotgun instead.
Beretta 92FS
Billy Darley (Garrett Hedlund) is seen throughout the movie using a 9mm Beretta 92FS pistol as his weapon of choice.
Remington 870 shotgun
A Remington 870 shotgun is seen in the hands of one of the gang members during the gas station scene & during the raid on the Hume residence.
Sig Sauer P226
Bodie (Edi Gathegi) is armed with a 9mm Sig Sauer P226 throughout much of the film, specifically near the end during the shoot-out in "The Office". The P226 can also be seen on Heco's (Hector Atreyu Ruiz) coffee table when Mr. Hume busts in, Hume prevents him from accessing it however with a blast from his Rossi Overland to the table.
Detective Wallis (Aisha Tyler) carries a .40 Glock 27 pistol as her sidearm throughout the film, it can be seen out of the holster and in her hand as she approaches the Hume residence near the end of the film.
MAC-10
Spink (Leigh Whannell) can be seen pulling a .45 MAC-10 off the dash of his parked van upon noticing Nick Hume speeding toward the van in the Plymouth duster. He has no time to get off a shot however. It can also be seen on the wall of Bones' safe when Mr. Hume is buying weapons from him.
Sig Sauer P229R
The stainless version of a SIG Sauer P229R can be seen on the wall inside Bones' vault when Mr. Hume goes to purchase weapons.
Glock 19
A two-tone Glock 19 with the slide chromed can be seen on the inside wall of Bones' gun vault in the scene where Nick Hume goes to buy weapons.
Taurus PT945
Can be seen on the inside wall of Bones' gun vault in the scene where Nick Hume goes to buy weapons.
Remington Model 870 Wingmaster
Can be seen on the rack inside of Bones' gun vault in the scene where Nick Hume goes to buy weapons.
Smith & Wesson Model 64
The clerk at the gas station scene sttempts to reach for his .38 Smith & Wesson Model 64 revolver that he kept behind the counter before Billy kills him with his .12 gauge Mossberg 500 Persuader shotgun.
Miscellaneous Guns
Can be seen on the rack inside of Bones' gun vault in the scene where Nick Hume goes to buy weapons.
Ruger Mini-14 can be seen on the rack on the door inside of Bones' gun vault in the scene where Nick Hume goes to buy weapons.
This folding stock equipped UZI knock-off can be seen on the rack on the door inside of Bones' gun vault in the scene where Nick Hume goes to buy weapons.
Pietta PPS-50 can be seen on the rack on the door inside of Bones' gun vault in the scene where Nick Hume goes to buy weapons.
Beretta 92FS Inox can be seen on the inside wall of Bones' gun vault in the scene where Nick Hume goes to buy weapons.