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The following weapons were used in the television series Gotham:
A janitor working for Morry Quillan uses a Beretta 92FS in "Selina Kyle" to execute abducted homeless children.
Colt M1911A1
In "Pilot", the mugger uses a Colt M1911A1 to murder the Waynes in an alley. It's seen tucked in the waistband of Ince's pants in the middle of "Selina Kyle".
Glock 17
Some of the officers in the Gotham City Police Department use Glock 17s as their main sidearm in the series. The robber briefly uses one near the end of "Arkham".
Heckler & Koch USP Compact
A Heckler & Koch USP Compact appears to be used by Doug (Frank Whaley) as his main sidearm throughout "Selina Kyle".
SIG-Sauer P226
Throughout the series, Detective Jim Gordon (Ben McKenzie) uses a SIG-Sauer P226 as his official sidearm with the GCPD. The fake Richard Gladwell (Hakeem Kae-Kazim) briefly uses Gordon's own P226 in "Arkham".
SIG-Sauer P226R
Some of the GCPD officers are armed with the SIG-Sauer P226R as their main sidearm in the series. At certain times, Gordon's P226 changes to a P226R.
Tokarev TT-33
A Tokarev TT-33 is used by Doug's female accomplice throughout "Selina Kyle".
Revolvers
Colt Python
Frankie Carbone (Danny Mastrogiorgio) appears to use a stainless steel Colt Python as his main sidearm, first seen in "Arkham". The robber (Jake Choi) also uses it briefly near the end of the same episode.
Smith & Wesson Model 19
Detective Harvey Bullock (Donal Logue) appears to use a Smith & Wesson Model 19 as his main sidearm throughtout the series.
Smith & Wesson Model 60
The Balloonman aka Davis Lamond (Dan Bakkedahl) arms himself with a Smith & Wesson Model 60 near the end of "The Balloonman" with Bullock using it to shoot down the weather balloon Lamond got strapped on. Bullock uses a Model 60 with at least a 4 inch barrel as his sidearm when he partnered with Detective Dix at the start of "Spirit of the Goat".
Smith & Wesson 686
A Smith & Wesson 686 is used by Detective Dix (Dan Hedaya) as his sidearm in "Spirit of the Goat" when he was still Bullock's partner back in the GCPD.
Submachine Guns
MP40
One of the hired gunmen (Ivan Quintanilla) is seen armed with a MP40 near the end of "Arkham".
Shotguns
Ithaca 37 "Stakeout"
Don Carmine Falcone's mafia soldiers open fire on Fish's goons with Ithaca 37 "Stakeouts" in "Pilot". One of the hired robbers fires his "Stakeout" to annouce the holdup in "Arkham".
Mossberg 500AT
Mossberg 500ATs are apparently used by gunmen working for Doug in "Selina Kyle".
Remington 870
A Remington 870 with a short barrel and breacher muzzle was used by one of the robbers to execute the restaurant's manager in "Arkham".