The Single Action Army revolver is prominently used by several characters in the film, most notabley Manco (spanish word meaning "one-handed", referring to the habit of the character of hiding one hand, until he uses it to fire his gun) (Clint Eastwood) aka "The Man With No Name", who once again uses a 5 1/2" Artillery model with a color case hardened frame and a silver rattlesnake grip.
Single Action Army "Buntline Special"
While I usually group all the Single Action Armies together, I figured the Buntline Specials deserved their own section due to the infamy of their usage in the film. Colonel Douglas Mortimer (Lee Van Cleef) makes use of two Buntline Specials, one seen in his saddle bags with a 18" barrel, and the other with a 10" barrel which he fits with a shoulder stock and uses like a carbine rifle. El Indio (Gian Maria Volontè) uses an 8" Buntline as his sidearm in the film as well.
Winchester 1892 Saddle Ring Carbine
Col. Douglas Mortimer (Lee Van Cleef) keeps a Winchester 1892 Saddle Ring Carbine in his saddle bag and uses it shoot out the outlaw's horse at the beginning of the film. Some of El Indio's thugs use them as well.
The old man who lives near the train tracks keeps a Lefaucheux Model 1854 pinfire revolver, and has Manco hand it to him as he rants on.
Remington 1866 Derringer
When one of El Indio's men is insulted by Mortimer, he goes for his gun only to be met by death from Mortimer's blued finish Remington 1866 Derringer he had hidden in his sleeve.
Volcanic Repeater Rifle
El Indio is seen brandishing a Volcanic Repeater rifle early in the film and later Manco carries one during the duel between Mortimer and El Indio. This gun bears a resemblance to the 1860 Henry Rifle presented to President Lincoln solely because it is a predecessor to the 1860 Henry Rifle designed by B. Tyler Henry. Regardless of any indication by Uberti, the weapon seen in the film is not their reproduction as no firm has EVER, EVER, EVER, engineered a reproduction of the Volcanic rocketball system, such being virtually impossible as no ammunition is manufactured and it was very unsuccessful to begin with. Watch the movie and you will see that the rifle is actually never fired, probably because such was IMPOSSIBLE, especially with regard to the creation of a "studio blank," something that could have been engineered with .44 Henry. Notice the thumbnail of an actual Henry rifle which is quite heavy and massive compared to the small-framed Volcanic which was also available as a pistol(note also the receiver sight on the Volcanic , a dead giveaway). Pictures of both the Volcanic rifle and pistol are available at winchestercollector.org and the confusion here is somewhat understandable as I have never seen a Volcanic rifle utilized in any other film, something that makes this film unique.
Marlin 1893
While not completly shown, some of El Indio's men appear to be armed with Marlin 1893 rifles.
Colt Lightning Rifle
A Colt Lightning Rifle is seen in Col. Mortimer's saddle bag and one of the deputies guarding the bank vault is armed with one.