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The following firearms were used on the Showtime series Californication:
The carjacker (Luis Moncada) who steals Hank's new Porsche in "Filthy Lucre" (1.09) uses a two-tone Glock 19.
Ithaca 37
Lew Ashby (Callum Keith Rennie) keeps an Ithaca 37 in his hallway, firing it into the air to end disagreements in his house.
Glock 17
A liquor store robber (Jonah Wharton) in "Dogtown" (3.10) holds a third generation Glock 17 on Charlie Runkle (Evan Handler). A tattoo artist in "Lawyers, Guns, and Money" (4.06) also has a Glock.
Beretta 92FS
Another liquor store robber (Mario Orozco) in "Dogtown" (3.10) holds a Beretta 92FS on Hank. A tattoo artist in "Lawyers, Guns, and Money" (4.06) also carries one.
Smith & Wesson Model 29
Kim (Philip Tan), the Korean convenience store owner in "Dogtown" (3.10), chases the robbers out of his store with several shots from his Smith & Wesson Model 29.
Flintlock Pistol
In "Comings and Goings" (3.11), Hank Moody (David Duchovny) and Stacy Koons (Peter Gallagher) duel with Flintlock Pistols when Koons gets drunk after one of his Civil War re-enactments.
M1911A1
Eddie Nero (Rob Lowe) draws a M1911A1 when at a tattoo parlor with Hank and Charlie in "Lawyers, Guns, and Money" (4.06). Hank (David Duchovny) takes it away from him after punching him in the face.
Smith & Wesson Model 36 Nickel
A girl in the tattoo parlor in "Lawyers, Guns, and Money" (4.06) draws a nickel Smith & Wesson Model 36 snubnose.
Beretta Cougar
As "Officer Kapinos" in a zombie film she is starring in, Sasha Bingham (Addison Timlin) fires a blank-firing Beretta Cougar at a pack of zombies in "Lights, Camera, Asshole" (4.08).
M16
In Hank's opening dream in "The Way of the Fist" (5.02), Samurai Apocalypse (RZA) fires an M16 at Hank, Scarface-style.
Beretta 92FS Inox
Big Jim Calloway, in a cameo, accidentally shoots Fatso-Fassano with a Beretta 92FS Inox during a scuffle in "The Way of the Fist" (5.02). Samurai Apocalypse (RZA) picks up and unloads the Beretta. An actor on Santa Monica Cop carries a prop Inox while filming a scene in "At the Movies" (5.09).
IMI Desert Eagle
Samurai Apocalypse (RZA) keeps a chrome Desert Eagle as his primary weapon during the fifth season, notably using it during the finale "Hell Ain't a Bad Place to Be" (5.12). Marcy Runkle (Pamela Adlon) grabs the Desert Eagle from Sam in 5.12 and uses it to pistol whip Stu Beggs in the crotch. Given that a loaded Desert Eagle weighs at least four pounds, this probably had the effect she desired.
SIG-Sauer P229R
Samurai Apocalypse (RZA) carries a SIG-Sauer P229R when in character for his film Santa Monica Cop in "At the Movies" (5.09) and "Hell Ain't a Bad Place to Be" (5.12). The gun appears to be a replica with muzzle flash added in post-production. Hank even comments to Tyler that it's a "fake gun", although Hank's knowledge of firearms is limited.
Heckler & Koch MP5A3
An actor portraying a bank robber in Santa Monica Cop fires a Heckler & Koch MP5A3 in "Hell Ain't a Bad Place to Be" (5.12).
Rubber Beretta 92FS
An actor portraying a bank robber in Santa Monica Cop uses a rubber Beretta replica in "Hell Ain't a Bad Place to Be" (5.12).