In "Pilot" (S1E01), Det. Ryan Lopez (Ramon Rodriguez) is given a Kimber SIS pistol that he carries throughout the series. The SIS pistol also is carried by Sam Chapel (Terry O'Quinn). In "Pilot" (S1E01), Chapel identifies the pistol as a "Kimber 1911". This particular model was originally manufactured for members of the LAPD's Special Investigation Section.
Glock 17
The Glock 17 is the original sidearm of Det. Ryan Lopez before he switches to the Kimber. The Glock 17 is the sidearm of FBI Special Agent Tae Kim (Sung Kang) and ICE Agent Veronica "Vee" Dotsen (Inbar Lavi).
Glock 17 (Two-Tone)
Sonny Watts (Myron Prime) uses a two-tone Glock 17 with an extended magazine during a standoff in "El Zorro y el Gallinero" (S1E08).
SIG-Sauer P229
The SIG-Sauer P229 is the sidearm carried by DEA Agent Cassius Green (RZA) throughout the series.
Beretta 92FS
The Beretta 92FS is used by gang members throughout the series. In the middle of "La Luz Verde", it's used by corrupt LA Sheriff's officer Rafael Nunez (Ben Bray) when Ryan barges into his residence at Panorama City.
Beretta 92G Elite 1A
In "Perros" (S1E04), a gangster holds a nurse hostage with what appears to be a Beretta 92G Elite 1A.
Heckler & Koch P7M13
A stainless steel Heckler & Koch P7M13 is used by Javier Acosta (Cliff Curtis) near the end of "Dia De Todos Los Santos" to fire at Metas Cartel gangsters, including Miguel Salazar.
Smith & Wesson 469
A Russian gangster appears to be armed with a Smith & Wesson 469 at the entrance of the pet clinic after the GTF initiates a raid in the middle of "Perros" (S1E04).
Smith & Wesson 5906
In "Invierno Cayo" (S1E05), a Smith & Wesson 5906 pistol is used by Andy Schiller (Jake Borelli) while under the influence of contaminated butter drugs. LAPD IA Detective Paul Carter (Jay Karnes) appears to have a 5906 in his duty holster, first seen in "El Zorro y el Gallinero".
Taurus PT 24/7
A Taurus PT 24/7 is brandished by a Korean drug dealer named Eddy Lin when the GTF tries to make an arrest in "Invierno Cayo" (S1E05).
Taurus PT911
A Taurus PT911 was handed to Daniel Acosta (Jay Hernandez) by a Metas Cartel gangster in "Regreso Del Infierno" (S1E07).
Walther PPK
A Walther PPK was used by Carlos Acosta to kill Detective James Tanner in "Pilot" (S1E01).
IMI Desert Eagle
A Long Beach Lords gangster threatens Daniel with the IMI Desert Eagle during a meditation attempt in "Almadena".
Brügger & Thomet MP9s are used by Metas Cartel assassins in "Dia De Todos Los Santos" as their main weapon.
Heckler & Koch MP5A3
The Heckler & Koch MP5A3 is used by the members of the Gang Task Force as well as gangsters throughout the series.
Heckler & Koch UMP
Several gangsters and assassins are armed with the Heckler & Koch UMP throughout the series.
Intratec TEC-9
LBL gangsters use the Intratec TEC-9 in "Pilot" (S1E01).
Ingram MAC-10
What appears to be an Ingram MAC-10 is used by a Metas Cartel gangster during a raid in "Almadena".
Assault Rifles
Colt Model 933
The Colt Model 933 is the main rifle carried by Gang Task Force, FBI SWAT and DEA FAST officers. Some of the rifles seen are actually Classic Army M15A4 CQB airsoft replicas.
AKMS
What appears to be an AKMS assault rifle is used by a Chino Skins armored car robber in "Pilot" (S1E01). Metas Cartel gangster use them as their main weapon in "Almadena".
AKMSU
The AKMSU is a weapon frequently carried by gangsters in the series.
FN SCAR-L
An FN SCAR-L assault rifle is seen used by a Chino Skins armored car robber who is chasing down an armored truck in "Pilot" (S1E01).
Heckler & Koch G36C
Vee is armed with a Heckler & Koch G36C, replacing the Colt Model 933 in "Entre Dos Tierras" (S1E06).
Heckler & Koch HK416
Ryan arms himself with a Heckler & Koch HK416 in "Regreso Del Infierno" (S1E07).
Sniper Rifles
Barrett M82A1
In "Pilot" (S1E01), Vee is seen using a Barrett M82A1 to provide cover.
Shotguns
Remington 870 (Breacher)
A Remington 870 shotgun fitted with a pistol grip, breaching muzzle, and saddle shell holder is used by officers of the Gang Task Force to breach locked doors.
Mossberg 500
A LBL gangster uses a Mossberg 500AT at the end of "Pilot" (S1E01).
Benelli M1 Super 90
A Benelli M1 Super 90 is seen used by Rodriguez's partner, Detective James Tanner (Ross Thomas) at the beginning of "Pilot" (S1E01).
Sniper Rifles
Nemesis Arms Vanquish
A Nemesis Arms Vanquish is seen in the GTF's armory/locker room in the middle of "Almadena".
Grenades
Model 7290 Flashbang
A Model 7290 Flashbang is used by Mete Cartel assassins in the middle of "Pecados del Padre" (S1E03).
Grenade Launchers
AGS-17
An AGS-17 automatic grenade launcher is seen at the debriefing screen at GTF headquarters in the middle of "El Buey Y el Alacran".
Rocket Launchers
Airtronic RPG-7
A LA gangster helps out Ryan evade LAPD pursuit by using an Airtronic RPG-7 to scare off LAPD and media choppers away near the end of "Regreso Del Infierno" (S1E07).
Rocket Launchers
Three rocket launchers are seen on the debriefing screen at GTF headquarters in the middle of "El Buey Y el Alacran". Though they could be (from top to bottom) an M72 LAW, an M136 AT4, and an M141 SMAW-D it is more likely they are RPG-18, RPG-22 or RPG-26 launchers given that this is an arms deal with the Bratva.
Others
Los Angelicos Arsenal
Tio shows off the LA Arsenal to Ryan and the other LA gangsters in preparation to hijack the Fishscale-type cocaine in "Regreso Del Infierno" (S1E07).