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 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 pistol also is used by the LAPD as their official sidearm.
Glock 17 (TTI Combat Master Package)
The Glock 17 in a TTI Combat Master Package configuration is used by the assassin (Tetiana Gaidar), first seen in "Bloodline".
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.
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 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). In the same episode, Baba (Pasha D. Lychnikoff) usses it to shoot Carl Rogers while in a cargo container.
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), The M&P recently became the standard department-issued duty weapon for the LAPD.
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 is seen used by the assassin while on the range in "Bloodline" (S1E08).
Assault Rifles
AK-type rifle
An AK-type rifle is seen in "Always/All Ways" in Afghanistan.
Colt M4A1
The Colt M4A1 is seen with US SF (Green Beret) commandos in Afghanistan in "Always/All Ways".
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.