Many variations of the Single Action Army revolver are used in the series.
Single Action Army Artillery Model (5.5" barrel)
Teddy Flood (James Marsden) carries an Artillery Model with a 5.5" barrel. A similar revolver is used by Craig (Currie Graham) in "The Original" (S1E01).
The Man in Black (Ed Harris) carries what appears to be a LeMat 1861 revolver, which is proven to be a customized cartridge-firing model rather than a percussion black-powder weapon. The Man in Black is seen reloading his revolver by breaking the weapon in half (the barrel and cylinder assembly from the frame), showing that the pistol has a cartridge cylinder similar to those produced by reproduction companies such as Uberti and Pietta (While this type of conversion wasn't existent in the Old West, this technically is not anachronistic as the series takes takes place in a futuristic theme park.) The Man in Black loads the revolver with what appear to be .38 Short Colt cartridges, as well as a long, brass shotgun shell (appears to be around a 20 gauge) in the underbarrel shotgun. He is then seen firing the revolver on the normal cylinders, but also flipping the switch on the hammer and firing the shotgun. Also, interestingly enough, it appears that The Man in Black carries an entire second barrel/cylinder assembly in a holster mounted on his belt behind the holster for the full pistol. While the purpose of this has not yet been demonstrated, it can be assumed that it is meant to be a quicker reload. A LeMat revolver is also seen used by a Confederado and then is picked up by William in "The Bicameral Mind" (S1E10).
Error creating thumbnail: File missingBeautiful Black Powder Reproduction LeMat 1861, made by Pietta of Italy - chambered in .44 cal with 20 Gauge center.Error creating thumbnail: File missingThe Man in Black (Ed Harris) draws the revolver in "The Original" (S1E01).Error creating thumbnail: File missingThe Man in Black (Ed Harris) sits with his revolver holstered in "Chestnut" (S1E02). Note what appears to be an entire second barrel/cylinder assembly (circled in red) behind the primary holster.Error creating thumbnail: File missingAn excellent shot of the 9-round LeMat cylinder with the shotgun barrel that doubles as the cylinder rod. .38 SHORT COLT can be read on the cartridges.Error creating thumbnail: File missingThe brass shotgun shell is seen before being loaded into the pistol (appears to be around a 20 gauge).Error creating thumbnail: File missingThe Man in Black reloads his revolver, which requires him breaking down the weapon. Note the cartridge cylinder, the main part of which is still mounted on the barrel assembly, and the "cap" lays adjacent to it on the table.Error creating thumbnail: File missingThe Man in Black raises his pistol, giving a perfect view of the LeMat. Note the custom cylinder and that, despite the fact that the weapon has been converted, the ramrod is still attached.Error creating thumbnail: File missingThe Man in Black demonstrates the LeMat's obvious advantage over other standard six-shooters by firing 9 rounds of .38 Short Colt, as well as the shotgun barrel.Error creating thumbnail: File missingThe LeMat revolver is seen on the ground in "The Bicameral Mind" (S1E10).
A Beretta Px4 Storm Sub-Compact appears to be the sidearm carried by Ashley Stubbs (Luke Hemsworth), the head of Westworld security. He notably pulls it in "The Original" (S1E01), "Trompe L'Oeil" (S1E07) and "The Well-Tempered Clavier" (S1E09).
The Beretta U22 Neos appears to be the pistol seen in the hands of both Clementine Pennyfeather (Angela Sarafyan) and Bernard (Jeffrey Wright) in "The Well-Tempered Clavier" (S1E09).
The Westworld QA security force carry customized FN P90 TRs as their weapon of choice in the series. These are first seen in "The Original" (S1E01) and the weapons are fitted with tactical rails, mounted flashlight, and curious red paint job. These weapons are also seen in the hands of both Hector Escaton (Rodrigo Santoro) and Armistice (Ingrid Bolsø Berdal) in "The Bicameral Mind" (S1E10).
In "The Adversary" (S1E06), Teddy is seen using a Gatling Gun to mow down US soldiers. In "Trompe L'Oeil" (S1E07), Confederados open fire on a train with the Gatling Gun.
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