Officer Bobby Hill (Michael Warren) carries a Smith & Wesson Model 19 as his standard sidearm and keeps it in his purse when he goes undercover in drag to catch a serial rapist in "Double Jeopardy" (1.05). It is also carried in early episodes by Det. Sgt. Michael "Mick" Belker (Bruce Weitz) and others. Officer Fuentes (Steven Bauer) carries a Model 19 in "Presidential Fever" (1.02), until it is taken from him by a mob of angry Puerto Ricans when he and Officer Harris wrongly accuse them of burglary. Renko (Charles Haid) and Coffey (Ed Marinaro) each shoot the gun-wielding suspect in "Hearts and Minds" (2.01) with Model 19s. In "Blood Money" (2.02), the taxi driver murderer holds a Model 19 on Belker while the latter is undercover working as a cabbie.
Beretta M1934
During the roll call in the pilot episode, "Hill Street Station" (1.01), an undercover detective can be seen placing a Beretta M1934 during Sgt. Esterhaus's weapons inspection due to "alleged carrying of bizarre and unauthorized weapons by the officers of this precinct".
Mossberg 500
LaRue's partner, Sgt. Neil Washington (Taurean Blacque), places a Mossberg 500 shotgun with wooden handgard and sawed-off stock on the table during the pilot episode's weapons inspection. This appears to be the same shotgun seen later in the episode as used by Hector Ruiz (Panchito Gomez), one of the convenience store robbers.
Colt Mk IV Series 70
Det. John "J.D." LaRue (Kiel Martin) places a Colt Mk IV Series 70 on the table during the pilot episode's weapons inspection.
Bryco pocket pistol
A female officer receives "assistance" from LaRue in removing a Bryco Arms compact pistol from her leg holster during the pilot episode's weapons inspection.
Colt Detective Special (1st Generation)
Capt. Frank Furillo (Daniel J. Travanti) carries a first generation Colt Detective Special in a shoulder holster, notably seen when he removes the holster upon confronting Hector in the pilot episode. Det. J.D. LaRue (Kiel Martin) has a 1st Generation DS as his standard issue sidearm, seen when surrendering it with his badge (and having it returned to him). Det. Henry Goldblume (Joe Spano) reluctantly draws his Detective Special when he is cornered by thugs after his car blows a flat tire while driving through the ghetto in "Double Jeopardy" (1.05). He tells his supervisor that, until Capt. Furillo noticed, he had always carried the revolver unloaded, never expecting to use it. In "Hearts and Minds" (2.01), a suspect (Charles Picerni) grabs Alf Chelsey's (Gerry Black) Detective Special and shoots up the station before he is killed by Renko, Coffey, and other cops.
Remington 870
Several officers from the Hill Street Station use Remington 870 shotguns. In the pilot episode, both Officers Bobby Hill (Michael Warren) and Andy Renko (Charles Haid) handle one during the armed robbery standoff with Hector in the pilot episode.
M16A1
The Emergency Action Team (EAT) utilizes M16A1 rifles. In some scenes that don't require the weapons to be fired, some EATers carry MGC M16 replicas (determined by the muzzle breaks on some of the guns). Some of Jesse John Hudson's gangsters in "The Last White Man on East Ferry Avenue" (2.03) have M16s.
Colt Python
Some of the Hill Street precinct officers carry Colt Python revolvers. The junkie who shoots Bobby and Renko in the pilot episode fires four shots from a 6" barrel Python, later recovered by LaRue and Washington while chasing down Billie (Karole Salmon) in "Film at Eleven" (1.06), with several policemen referring to the weapon by its caliber, notably Washington referring to it over the phone as a "3-5-7 Magnum". Bobby Hill (Michael Warren) carries a Python in "I Never Promised You a Rose, Marvin" (1.12) when he and Renko pull over a man before helping his wife deliver her baby. A Python is also one of the weapons seen on the table during the same episode as Furillo argues with Swanson. EAT commander Sgt./Lt. Howard Hunter (James B. Sikking) keeps a Python in a large shoulder holster. It is first seen in "Politics as Usual" (1.03), when Hunter is telling Capt. Furillo that "a Steyr SSG hits from a thousand yards" during an argument about security for the President's upcoming visit to Hill Street Precinct and later referenced by Hunter in "Rites of Spring, Pt. 1" (1.14) when he mentions that he introduced himself to a woman locked out of her apartment by blowing the broken lock off with his ".357".
Undercover Det. J.D. LaRue (Kiel Martin) carries a third-generation Colt Detective Special in an ankle holster in "Politics as Usual" (1.03) when he tells his partner, Sgt. Washington, that he's got "a .38 strapped to [his] ankle". Det. Washington (Taurean Blacque) also carries a 3rd Generation Detective Special, notably seen when arresting Eddie Hoban (Rob Berger) in "Film at Eleven" (1.06). Capt. Frank Furillo (Daniel J. Travanti) draws his own from a shoulder holster when questioning Eddie's girlfriend Sherry in "Choice Cut" (1.07), trying to see if she was telling the truth by discerning between his own Detective Special and a suspect's Colt Python.
Ithaca 37
Several officers at the Hill Street station, including Sgt. Esterhaus (Michael Conrad) prepare for a potential attack from the local gangs in "Can World War III Be An Attitude" (1.04) with Ithaca 37 shotguns. Bobby Hill (Michael Warren) grabs one from his and Renko's patrol car en route the armed robbery in "Choice Cut" (1.07). Santini (Jeff Seymour) briefly handles one inside the patrol car in "Up in Arms" (1.08). Both LaRue (Kiel Martin) and Washington (Taurean Blacque) fire Ithacas at the liquor store robbers in "Your Kind, My Kind, Human Kind" (1.09), with Washington fatally wounding one of the robbers with his. Lt. Howard Hunter (James B. Sikking) can be seen loading and carrying an Ithaca 37 in "Hearts and Minds" (2.01).
double-barreled shotgun
Two of the thugs with Hector, including Juan (Jay Moreno) use double-barreled shotguns when holding the hostages in the back of Chuckie's in "Choice Cut" (1.07). A liquor store robber in "Your Kind, My Kind, Human Kind" (1.09) also carries one. When an armed robber tries to rob Belker's (Bruce Weitz) sting pawn shop operation in "Jungle Madness, Pt. 1" (1.16) with one, Belker shows him the two identical shotguns held by his detectives, telling the robber that they are a "12 gauge double barrel with a money back guarantee pointed right between your eyes!" When Belker places it down at the station, it accidentally fires and destroys a vending machine in the station. In "Jungle Madness, Pt. 2" (1.17), a motorist uses one to shoot Officer Joe Coffey. Mr. Popovich (Reuven Bar-Yotam) kills a young Latino with a double-barreled shotgun with exposed hammers in "The Last White Man on East Ferry Avenue" (2.03), which Goldblume (Joe Spano) takes from him and gives to Renko (Charles Haid).
M9 Bazooka
One of Lt. Hunter's EATers carries what Hunter claims is a "Soviet 109 incendiary rocket launcher" when his squad carries "riot gear on loan from the Stockholm police" during the hostage crisis in "Choice Cut" (1.07). It is in fact a M9 Bazooka.
Lt. Howard Hunter (James B. Sikking) is seen looking over a Winchester Model 70 in "Your Kind, My Kind, Human Kind" (1.09). To his disappointment, he finds "strawberry jam in the trigger housing" and accidentally breaks the weapon when he racks the bolt too hard for emphasis.
M1911A1
Lt. Hunter's EATers (with the exception of himself) carry M1911A1 pistols in their holsters. In "The Last White Man on East Ferry Avenue" (2.03), Jesse John Hudson (Danny Glover) uses a nickel 1911 to murder Virgil and a female gang member.
lupara
An armed robber who faces off with Belker after trying to rob a bus in "Rites of Spring, Pt. 1" (1.14) carries a lupara.
Smith & Wesson Model 36
Narcotics Officer Charlie Weeks (Charlie Hallahan) draws and fires a Smith & Wesson Model 36, which he identifies to Internal Affairs as his "S&W .38" when he kills one of the drug dealers in "Rites of Spring, Pt.1 " (1.14).
Walther PPK
Officer Bates (Betty Thomas) is seen placing a pearl-gripped Walther PPK confiscated from a street thug into a box at the beginning of "Jungle Madness, Pt. 2" (1.17). Jesse John Hudson's girlfriend/lawyer Samantha (M.E. Loree) shoots Hudson on the courthouse steps in "The Second Oldest Profession" (2.04) with an all-black PPK.
Browning Hi-Power
One of Hunter's EATers holds a Browning Hi-Power on a suspect in "Hearts and Minds" (2.01).
"Cyclops II grenade launcher"
During the standoff outside Mr. Popovich's house in "The Last White Man on East Ferry Avenue" (2.03), Lt. Hunter (James B. Sikking) mentions the EATers' new "Cyclops urban warfare grenade launcher".