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The following weapons were used in Season 2 of the television series The Flash:
Detective Joe West gives a Colt Mustang II to Iris West as a precaution in the middle of "The Darkness and the Light".
Glock 17
The Glock 17 was briefly used by Oliver Queen (Stephen Amell) in "Legends of Today" when Malcolm Merlyn barges in on his hideout.
Glock 17 (Full Auto)
What appears to be a photo of a full auto version of the Glock 17 is seen in an evidence photo at CCPD HQ in "Flash of Two Worlds".
Glock 26
A Glock 26 serves as Patty's off-duty sidearm in the season.
M1911A1
A M1911A1 was briefly used by Lewis Snart (Michael Ironside) throughout "Family of Rogues" as his main sidearm.
SIG-Sauer P228
The SIG-Sauer P228 returns as Detective Joe West's main sidearm in the season.
Revolvers
Smith & Wesson Model 27
What appears to be a Smith & Wesson Model 27 is used by Earth-2 Iris and Floyd Lawton as their sidearms in the CCPD.
Assault Rifles
Colt M4A1
The Colt M4A1 is seen with American law enforcement in the season. It's briefly seen with Damien Darkh's mercenaries in "Legends of Today".
Others
Captain Cold's Cold Gun
Captain Cold's Cold Gun is seen back in the season as his main weapon.
Boot
The Boot is an anti-Metahuman weapon developed by Cisco Ramon at the start of "The Man Who Saved Central City" and later by Patty in "Running to Stand Still". The core of the weapon appears to be based on a modernised M14 variant such as the Mk 14 Mod 0 EBR or EBR-RI, most likely a replica due to the fact that both the barrel and the gas tube have been cut off just ahead of the handguard.
Thermite Bomb Extractor
Cisco uses a thermite bomb extractor gun to take the bomb out of Lisa Snart's head near the end of "Family of Rogues". Parts of this device, most notably the scope rail, appear to be taken from a Maruzen airsoft CA870 CQB.
Laser Rifle
A laser rifle is seen used by Harrison Wells near the end of "The Fury of Firestorm" after he takes down King Shark. In "The Darkness and the Light", you can see that the laser rifle is a UTAS UTS-15 shotgun. The stock is clearly visible when Harrison Wells has it slung over his shoulder and when he racks it there are cosmetic attachments visible on the forend and barrel.
Custom Sniper Rifle
A customized sniper rifle to fire serum bolts was used by Joe, Earth-2 Harrison Wells and Cisco to take out Zoom throughout "Enter Zoom".
Two-Shot Derringer
Cisco uses a two-shot custom derringer in "Welcome to Earth-2" when he fires it at Killer Frost.