Every working member of the robbery crew was armed with one Smith & Wesson 659 9mm pistol. They are distinguished from 1911 and other Smith & Wesson variants by their second generation features, stainless steel construction, and double stack frames.
Though all of the thieves guns look to be the same, Mr. Orange's (Tim Roth) Smith & Wesson 659 has a round trigger guard and a black magazine, further alluding to the fact that he is not like the rest of the thieves.
Smith & Wesson 669
In a continuity error, Mr. Pink (Steve Buscemi) is seen with a Smith & Wesson 669 in his shoulder holster when he is knocked on the ground by Mr. White (Harvey Keitel). It is noted as so by its wraparound grips, spurred hammer, lack of adjustable sites, shorter frame, and magazine plate.
Smith & Wesson 639
Though everyone is given a Smith & Wesson 659 for the robbery, Mr. White (Harvey Keitel) is seen using a Smith & Wesson 639 with Pachmayr grips most of the time. We can assume, being that he is a professional thief, that this is his personal gun, and not a continuity error in the film. During the getaway, he is seen dual wielding his personal Smith & Wesson 639 with his issued Smith & Wesson 659, further strengthening this theory. In the special edition DVD, on the second disk a deleted scene can be found which briefly shows Mr White's/Larry Dimmick's police record. This informs us that his weapon of choice is a Smith and Wesson 9mm, even further strengthening the personal 639 theory.
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Beretta Jetfire
Mr. Orange (Tim Roth) , packs 2 handguns while getting ready to meet Eddie and Mr. White for a meeting with Joe. The automatic he holsters on his ankle is a Beretta Jetfire in .25 ACP.
Charter Arms Off Duty
Mr. Orange's second gun is a Charter Arms Off Duty with Pachmayr grips. He checks to make sure the cylinder is loaded, swings the cylinder back in, and then places it in his coat pocket.
Colt Detective Special
After Mr. White (Harvey Keitel) kills the pursuing cops with his two pistols, he and Mr. Orange (Tim Roth) walk until they find a car driving by. They aim their guns at the driver, a woman, and attempt to take it. She produces a pre-1972 nickel plated Colt Detective Special from her glove compartment and shoots Mr. Orange in the stomach as he opens the door to pull her out of the car. Another Detective Special is "Mexican carried" by Joe Cabot (Lawrence Tierney), distinguished as a Detective Special by its round edged butt, which he uses to shoot Mr. Orange. It is likely that the same gun was used in both scenes.
Smith & Wesson Model 66 Snub Nose
Nice Guy Eddie (Chris Penn) uses a Smith & Wesson Model 66 Snub Nose during the final scene in the film, which he uses to kill the hostage LAPD officer. In the final standoff between Nice Guy Eddie , Joe Cabot, and Mr. White, Eddie aims his Smith & Wesson at Mr. White, threatening to kill him if he doesn't take his gun off of his father, Joe.
Smith & Wesson Model 19
The police officers in the scene where Mr. Pink is being chased all carrying Smith & Wesson Model 19 revolvers.