Det. Christian Walker (Sharlto Copley) is seen carrying a Beretta Px4 SC fitted with a Compact Magazine Adapter as his carry weapon. Detective Pilgrim and another PD detective are seen using them in the season finale "Fuck the Big Chiller" (S01E10).
A officer of the LAPD's Powers Division is seen wielding 2 pistols one of which is a Desert Eagle. due to the lighting of the scenes it is almost impossible to tell which model.
M1911 Style Pistol
The same Detective's second pistol appears to be an M1911 variant, but again is never seen clearly enough for proper identification.
Glock 19
Captain Cross (Adam Godley) is seen carrying a Glock 19 as his carry weapon in "Level 13" (S01E09).
SIG-Sauer P228
Detective Zabriski (Phillip DeVona), a member of Powers division, is seen using a SIG-Sauer P228 as his carry weapon in "Fuck the Big Chiller" (S01E10).
Crosman 2240 CO2 Pistol
A Powers Division detective uses a Crosman 2240 CO2 Pistol in a stainless steel finish to administer a sedative on a superpowered criminal in the pilot episode.
Revolvers
Taurus Judge
Johnny Royalle (Noah Taylor) is seen checking a Taurus Judge in "Aha Shake Heartbreak" (S01E08). Christian Walker (Sharlto Copley) is also seen with this revolver in "Level 19" (S01E09).
Assault Rifles
Heckler and Koch G36C
An unnamed LAPD officer is seen loading up a Heckler & Koch G36C with a vertical foregrip in the Pilot episode. In reality, the G36C are issued to the LAPD SWAT officers instead of the ordinary patrolmen.
FN F2000 Tactical
Guards at "The Shaft" are seen with FN F2000 Tacticals during 'The Shaft' Incident. They are seen again in "Level 13" (S01E09)
Colt M4A1
A Powers Division Detective is seen with what looks like an M4A1 fitted with an ACOG sight, during 'The Shaft' incident. One is also seen in a LAPD police van at the start of "Fuck the Big Chiller" (S1E10).
AKS-74U
A Powers Division officer is seen carrying a AKS-74U with a flashlight crudely taped to the end of the weapon in "Devil in a Garbage Bag".
Detective Walker (Sharlto Copley) can be seen carrying a Remington Model 870 with a door breaching attachment, vertical foregrip, and 2 Flashlights attached to either side of the barrel.
Ithaca 37
Captain Cross (Adam Godley) is seen carrying what looks like a Ithaca 37 during 'The Shaft' incident.
Sniper Rifles
Unknown
What appears to be a sniper rifle based on a M14 with an enhanced chassis is seen on a small arms locker in "Pilot".
Others
Shaft Armory
A variety of weapons are seen in the Shaft armory in "Devil in a Garbage Bag".