The following weapons were used in the anime series Fate/Zero:
In "Where Justice is Found", a young Kiritsugu uses a Beretta 92F as his main sidearm before he switches to the Calico.
A Calico M950 is seen in "Land of Fuyuki City", present in the arsenal of Kiritsugu Emiya and Maiya Hisau. In the light novels, it's detailed that the duo use it as a backup weapon. It's first located in an arms cache case brought by Kiritsugu in "The Evil Forest". First used in "The Evil Forest" and "The Magus Killer" by both Kiritsugu and Maiya. They are seen again in "The Last Command Seal".
Natalia uses a M1911A1 as her sidearm in "Distant Memories". They are also partially seen in "Where is Justice" in an arms cache hidden in Natalia's luggage.
Maiya Hisau pulls out a full-sized 2nd generation Glock 17 pistol as a backup weapon after losing her Steyr AUG from a surprise visit by Kirei Kotomine, first seen in "Night of Schemes". Located in an arms cache case brought by Kiritsugu in "The Evil Forest" and wielded once again by Maiya in "The Magus Killer".
Kiritsugu first wields it in "Knight on Two Wheels".
Remington 1866 Derringer Derringer
Natalia has a Remington 1866 Derringer as a backup weapon in "Where Justice is Found". It is never fired however.
Thompson Arms Contender
A Thompson Arms Contender pistol was used by Kiritsugu Emiya as his main sidearm in the 4th Holy Grail War, which appeared in both the anime and in the light novel series. It first appeared in "Land of Fuyuki City". In the anime, you can tell that it's the .223 Remington version due to the presence of the rear sights, which was also shown in the said episode. In the light novel series, it is specifically detailed to have had a barrel swap and utilize .30-06 cartridges. This pistol utilizes custom-made bullets called "Origin Bullets", created from magic which involves Kiritsugu's rib bones.
A young Kiritsugu takes a Tokarev TT-33 from his dad's drawer in the episode "Distant Memories".
Natalia draws a Walther PP on a ghoul in "Where Justice is Found".
Webley Mk. IV
Kayneth uses a Webley Mk. IV to assassinate Risei while he was distracted in "The End of Honor". The revolver seems to have a shorter barrel than what the Mk. IV has, as well as a slightly different grip.
Heckler & Koch MP5A3
A Heckler & Koch MP5A3 are used by Berserker in "The Sea of the ends" in a standoff when he and Saber fought in a parking lot building. In the light novel, Berserker was equipped with dual MP5A3s.
Steyr AUG A1
A Steyr AUG A1 with a black plastic body was used by Maiya Hisau as her main weapon in the anime, which was also portrayed in the light novel during the 4th Holy Grail War. She first uses it in "Blade of the Demonic Spear". Located in an arms cache case brought by Kiritsugu in "The Evil Forest". Also found in "The Last Command Seal" in Kiritsugu's arms cache.
Natalia in "Distant Memories" used a sawed off Remington 870 as her main weapon in battling the ghouls in Alimango island. It's seen also in "Where Justice in Found" in a hidden arms cache placed in Natalia's luggage and being carried by Kiritsugu.
Berserker uses a Barrett M82A1M as his main weapon when he confronted Saber in the episode "The Sea of the ends".
In "Where Justice is Found", a young Kiritsugu uses a Remington 700 to take down a target in New York City.
Walther WA 2000
A Walther WA 2000 is shown in "Land of Fuyuki City", serving as Kiritsugu Emiya's main weapon of choice in the series, as well as in the light novel during the 4th Holy Grail War. The only difference is that Kiritsugu had replaced the Schmidt & Bender 2.5–10X telescopic sight with either a AN/PVS04 or a IR heat vision scopes to locate the heat signatures of magi hiding from physical sight. He first uses it in "Blade of the Demonic Spear".
Later in "The Bloody Battle of Mion River", Kiritsugu uses the WA 2000 to assassinate Ryunosuke near the shore of Mion River to prevent his Servant Caster from harming Fuyuki City any further.
What appears to be M67 fragmentation grenades are among the weapons in the arms cache assembled by Maiya in the local Fuyuki Hotel in "Land of Fuyuki City". They are seen again in "The Last Command Seal".
M18 Smoke Grenade
A M18 Smoke Grenade is thrown by Kiritsugu to distract Kirei, allowing Maiya to escape in "Night of Schemes". Has an error with M78 written in place of M18.
Model 7290 Flashbang
A Model 7290 flashbang grenade is visually inspected by Kiritsugu from the arms cache Maiya assembled in the local Fuyuki Hotel in "Land of Fuyuki City". They are partially seen in "The Last Command Seal".
Hughes M230 Chaingun
A Hughes M230 Chaingun was seen fired by an Apache gunship on the television set in Waver's room when he was staying with the Mackenzies in Fuyuki City in "Land of Fuyuki City".
A couple of Japanese Air Self-Defense Force F-15J fighters are armed with the M61 Vulcan as its main machine gun before they began to engage Caster in "The Bloody Battle of Mion River". Berserker controls one of the two F-15Js against Gilgamesh as its Noble Phantasm after Caster's tentacle monster killed the other pilot by consuming his fighter. Berserker uses the M61 as its Noble Phantasm in "The Golden Radiance" before Gilgamesh destroys it.
Walther Kampfpistole Z
Kiritsugu uses the Kampfpistole Z flare pistol in "The Golden Radiance" to signal an attack against Caster.
A young Kiritsugu uses a FIM-92A Stinger in "Where Justice is Found" to take down an Airbus passenger jets full of ghouls to prevent it from reaching La Guardia airport.
Plastic Explosives are seen next to the Calico M950, which are among the weapons in the arms cache assembled by Maiya in the local Fuyuki Hotel in "Land of Fuyuki City". Later seen in "The Evil Forest". Located in an arms cache case brought by Kiritsugu in "The Evil Forest". They are seen in Kiritsugu's arms cache in "The Last Command Seal".