Memento

(Note: As most of the film is shown backwards in the order from which they actually happened, all screencaps and gun listings are shown in the film's chronological order. This is why a character is seen using weapons before he actually gets ahold of them.)

The following firearms were used in the film Memento:

Memento (2000).

Smith & Wesson 3913

Leonard Shelby (Guy Pearce) takes a Smith & Wesson 4516 from Dodd (Callum Keith Rennie), who used it to shoot at him. Leonard uses it through the first half of the film.

Smith & Wesson 4516 - .45 ACP.

Leonard loads the S&W 4516.

Leonard shows Teddy the pistol.

After taking Dodd's pistol, Leonard places it in the hotel nightstand on top of the bible.

Dodd aims his gun at Leonard.

I am pretty sure this gun is a 3913. The magazine's base plate is a dead give away, also as most people have said that movie armorers generally use 9mm pistols as prop guns..that should say something too.

Beretta Cougar Inox

Leonard Shelby (Guy Pearce) uses a Beretta Cougar Inox with white grips in the flashback to his wife's attack.

Beretta Cougar 8000 Inox 9mm with wood grips

Leonard grabs his Cougar.

Leonard approaches the bathroom.

Leonard fires at his wife's attackers.

Smith & Wesson Model 19 Snubnose

Leonard Shelby (Guy Pearce) takes a Smith & Wesson Model 19 from "Teddy" (Joe Pantoliano).

Smith & Wesson Model 19 Snub Nose - .357 Magnum.

Leonard empties the bullets out of the S&W snub.

Leonard tells Teddy he is going to hang onto his Model 19.