Detective Hieronymus "Harry" Bosch (Titus Welliver) continues to carry a Kimber Custom TLE II as his service weapon. The Kimber is the pistol author Michael Connelly specifies as Bosch's LAPD sidearm in his later novels.
Glock 17
Bosch's partner, Detective Jerry "J. Edgar" Edgar (Jamie Hector) carries the Glock 17 as his service weapon. Other LAPD officers also armed with the Glock include Chief Irvin Irving (Lance Reddick), Det. Rondell Pierce (DaJuan Johnson), and Det. Christina Vega (Jacqueline Obradors). (The Glock 22 was previously the official department issue of the LAPD). The Glock fitted with a suppressor is used by several criminals, including Dalton Walsh (Chris Vance).
Beretta 92FS
The Beretta 92FS, which was previously the department-issued service weapon of the LAPD, is seen carried by several veteran officers, including Det. Jimmy Robertson (Paul Calderon) and Lt. Grace Billets (Amy Aquino).
Beretta 92FS Inox
The Beretta 92FS Inox appears to be seen in "The Last Scrip" (S5E03) with Jose Esquivel Jr. (Yani Gellman).
Heckler & Koch VP9
A Heckler & Koch VP9 is the primary weapon used by "Sheriff" (Ryan Dorsey) and Stones (Billy Lush). A similar pistol is held by Bosch following a fight on the plane in "Salvation Mountain" (S5E08).
SIG-Sauer P226
A SIG-Sauer P226 is wielded by Vardy (Chris Ashworth) in "Wisdom of the Desert" (S5E07). He uses it with a suppressor in "Creep Signed His Kill" (S5E10).
Smith & Wesson 459
A Smith & Wesson 459 is seen in "Raise the Dead" (S5E04) when Jerry sees it in a drawer.
Taser X26
The green Taser X26 is seen with LAPD officers as their standard non-lethal sidearm.
Revolvers
Smith & Wesson Model 60
While undercover, Bosch keeps a Smith & Wesson Model 60 in his backpack. Dalton Walsh (Chris Vance) confiscates this revolver and uses it to threaten Bosch in "Two Kinds of Truth" (S5E01).
Ruger SP101
In "Two Kinds of Truth" (S5E01), Bosch finds a Ruger SP101 in the desk drawer of a pharmacy.
Submachine Guns
Smith & Wesson M76
A Smith & Wesson M76 is seen in Bosch's weapons safe in "Creep Signed His Kill" (S5E10).
Shotguns
Remington 870 (various)
A Remington 870 is the standard shotgun used by LAPD officers in the series. Some of these shotguns are fitted with a Surefire dedicated forend weaponlight. Remington Model 870 shotguns used for less-lethal operations are used by the LAPD.
Mossberg 500 (Cutdown)
In "Creep Signed His Kill" (S5E10), Bosch takes out a Mossberg 500 shotgun with a cutdown barrel from his weapons safe.
Mossberg 500 Cruiser
What seems to a Mossberg 500 Cruiser with a foregrip is seen in "Hold Back the Night" (S5E09).
Other
LA Times Article
In "Creep Signed His Kill" (S5E10), an LA Times article shows several pistols seized during a raid.