The CZ 75BD is used by Lev Ivanovich (Bogdan Yasinski) when he arrives in LA in "Pumped" (S1E02).
Glock 17
What appears to be a Glock 17 pistol is used by Baba (Pasha D. Lychnikoff) in "Chain of Authenticity" (S1E06) when confronting Carl Rogers while in a cargo container. In the same episode, the Glock 17 is also visible in the hands of Honey Chandler (Mimi Rogers), sometimes being in a continuity error for the Glock 19 she's been seen carrying in her handbag. The Glock 17 also is used by some LAPD officers as their sidearm (mostly notably Police Officer III's who would have been issued the pistol during their time in the police academy).
Glock 19
The Glock 19 is seen carried and used by defense lawyer Honey Chandler (Mimi Rogers) in the aftermath of nearly being assassinated in the seventh season of Bosch. It's seen with other characters from time to time.
Agency Arms Glock 19
What appears to be a Glock 19 that has been customized by Agency Arms is used by the assassin (Tetiana Gaidar), first seen in "Bloodline" (S1E08).
Heckler & Koch P7
The Heckler & Koch P7 is seen with Harry as his secondary sidearm, which he takes from John Creighton's suitcase.
Heckler & Koch P30
A Heckler & Koch P30 with a suppressor is used by the assassin (Tetiana Gaidar) in "Cat Got a Name?" while tasked to take down a target.
Kahr K9
A Kahr K9 pistol appears to be seen used by James Sharp (Reuben J. Lee) during a traffic stop in "Chain of Authenticity" (S1E06).
Kimber SIS Custom/RL
Kimber SIS Custom/RL pistols are used by detectives with the LAPD's Special Investigation Section (SIS).
Smith & Wesson M&P
The Smith & Wesson M&P pistol is seen as the sidearm carried by Maddie Bosch (Madison Lintz) and other new recruits. The M&P was the standard issue pistol of the LAPD at the time of production, though it has since been replaced by the FN 509 MRD-LE (selected in August, 2021, with first deliveries happening in January, 2022).
Springfield Armory XD
A Springfield Armory XD pistol is pulled by a gangster at the gas refinery in "Plan B" (S1E05).
Revolvers
Smith & Wesson Model 386
As a private detective, Harry now uses what appears to be a Smith & Wesson Model 386 "Night Guard" revolver as his weapon of choice.
Submachine Guns
SIG-Sauer MPX
A SIG-Sauer MPX with a Lancer Systems M-LOK handguard and a Maxim Defense collapsible stock is seen used by the assassin (Tetiana Gaidar) while on the range in "Bloodline" (S1E08).
Assault Rifles
AK-47
What appears to be an AK-47 rifle is seen used by a Taliban fighter in Afghanistan "Always/All Ways" (S1E10).
M4A1
The M4A1 is seen with US Special Forces commandos in Afghanistan in "Always/All Ways" (S1E10).
Shotguns
Remington Model 870
The Remington Model 870 is used by LAPD patrol officers as their primary shotgun. It's seen in the hands of LAPD Officer Maddie Bosch (Madison Lintz). Maddie and the other officers also carry Remington shotguns fitted with green furniture that carry "less lethal" beanbag rounds.
Machine Guns
Browning M2HB
A Browning M2HB machine gun is seen mounted on a US military Humvee during a flashback to Bosch's service in Afghanistan in "Always/All Ways" (S1E10).
M230 Chain Gun
The M230 Chain Gun is seen on photos of the AH-64 Apache in Vance's office in "Plan B" (S1E05).
Less Than Lethal
Taser X26P
A Taser X26P pistol with green furniture is carried by LAPD patrol officers.
Remington 870 "Less Lethal"
A Remington 870 shotgun loaded with "less lethal" beanbag rounds is one of the standard weapons now carried by LAPD patrol officers. The shotgun is fitted with green furniture and has an extended mag tube.