In Season 5's "The Jeopardy Room", Major Ivan Kuchenko (Martin Landau) is seen drawing a Colt Model 1908 Vest Pocket from his pants and training it on Commissar Vassil (John van Dreelen).
Mauser C96
Also in Season 5's "The Jeopardy Room", Boris (Robert Kelljan) uses a Mauser C96 to fire at Major Kuchenko.
Colt 1911
In Season 1's "People Are Alike All Over", Sam Conrad (Roddy McDowall) takes a M1911 from his spaceship to explore Mars. Some M1911 pistols are used by the soldiers in "The 7th is Made Up of Phantoms".
Smith & Wesson Model 10
A long barreld Smith & Wesson Model 10 is taken by Robert Wilson (William Shatner) from a policeman's holster to shoot a Gremlin in "Nightmare at 20,000 Feet".
Smith & Wesson Model 10 HB
In Season 1's "Execution" (S1E26), a cowboy brought to the 20th century, Joe Caswell (Albert Salmi), takes a Smith & Wesson Model 10 from Professor Manion (Russell Johnson) when venturing out into modern day New York.
Colt Police Positive
Rocky Valentine (Larry Blyden) uses a Colt Police Positive in the episode "A Nice Place To Visit" to shoot at police after a robbery, before being shot himself. He also uses one to try to shoot his guardian angel, with no effect.
Colt Single Action Army
Rance McGrew (Larry Blyden), Jesse James (Arch Johnson), and other actors playing cowboys use Single Action Army revolvers with 4 3/4 barrels in "Showdown with Rance McGrew". Rance shows his ineptitude by accidentally throwing it into the window when trying to draw.
Rifles
M1 Carbine
The M1 Carbine fitted with extended 30-round magazines is used in several episodes. In "The 7th is Made Up of Phantoms", Cpl. Langsford (Warren Oates) is seen armed with the rifle.
Karabiner 98K
In Season 4's "No Time Like the Past" (S4E10), Paul Driscoll (Dana Andrews) is seen holding a Karabiner 98k with a 1.5x zeilfenrhor 41 (ZF 41) scope in his hotel window and aiming it at Adolf Hitler.
Submachine Guns
Sten
The Sten is seen carried by several crewmembers of a crashed rocket ship in Season 1's "I Shot An Arrow into the Air" (S1E15).
Shotguns
12 Gauge Double Barreled Shotgun
In "The Monsters Are Due on Maple Street", Steve Brand (Claude Akins) is seen holding a 12 Gauge Double Barreled Shotgun that Charlie Farnsworth (Jack Weston) uses to shoot at what he thinks is an alien invader.