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 a Glock 17 as his service weapon. Other LAPD officers also armed with the Glock include Deputy Chief Irvin Irving (Lance Reddick) and Eddie Arceneaux (James Ransone). (The Glock 22 is the official department issue of the LAPD).
Salient Arms International Glock 17
Nick Riley (Nick Gomez) draws what appears to be a Glock 17 with a customized Salient Arms International slide in "Follow the Money" (S2E08).
Beretta 92FS
The Beretta 92FS, which was previously the department-issued service weapon of the LAPD, is seen carried by some officers in Season 2.
A Colt M1911A1 is seen in Carl Nash's safe in "Exit Time" (S2E07).
IMI Desert Eagle
What appears to be an IMI Desert Eagle is seen tucked in the waistband of a kidnapper in "Gone" (S2E05).
Ruger Mk III Suppressed
What appears to be a Ruger Mk III Pistol with a suppressor at the beginning of Season 2's premiere "Trunk Music" (S2E01). It's later secured as evidence in "Who's Lucky Now?"
Bernardo Piccininni (Rick Otto) draws what appears to be a Colt Python in "Follow the Money" (S2E08).
Smith & Wesson Model 10
A Smith & Wesson Model 10 is seen with Nash in "Everybody Counts" (S2E10).
Smith & Wesson Model 500
A Smith & Wesson Model 500 is seen on warning sign outside Carl Nash's house in "Exit Time" (S2E07).
Shotguns
Mossberg 500
A Mossberg 500 is seen used by Detective Jerry "J. Edgar" Edgar (Jamie Hector) in "Gone" (S2E05) during a rescue op to save Eleanor and Maddie.
Remington 870
A Remington 870 also is used by Detective Jerry "J. Edgar" Edgar (Jamie Hector) as his main weapon in the LAPD. It's seen in Carl Nash's safe in "Exit Time" (S2E07).
Sawed-off shotgun
A sawed-off shotgun is used by armed gangsters when corrupt cops raid their neighborhood in "Gone" (S2E05).
Submachine Guns
SIG-Sauer MPX
The SIG-Sauer MPX is first seen in the gun safe owned by Carl Nash (Brent Sexton) in "Exit Time" (S2E07). He later uses the weapon in "Follow the Money" (S2E08). This weapon is later seen in the LAPD crime lab in Season 2's finale "Everybody Counts" (S2E10). This is one of the earliest appearances of the weapon in a film or television series.
Heckler & Koch UMP45
The Heckler & Koch UMP is seen in Nash's gun safe in "Exit Time" (S2E07).
Heckler & Koch MP5A2
The Heckler & Koch MP5A2 is carried by SWAT officers while making a raid in Las Vegas in "Who's Lucky Now?" (S2E04).
Rifles/Carbines
Colt Model 933
Bosch is seen using a Colt Model 933 during a hostage situation in "Gone" (S2E05).
M4A1
SWAT officers are armed with the M4A1 while making a raid in Las Vegas in "Who's Lucky Now?" (S2E04).
M1 Garand
M1 Garands are used by the LAPD Honor Guard unit at the start of "Exit Time" (S2E07).