The Glock 17 is the sidearm carried by the majority of the detectives in the Special Intelligence Unit of the Chicago PD including Antonio Dawson (Jon Seda), Officer Adam Ruzek (Patrick John Flueger), and Alvin Olinsky (Elias Koteas). The Glock is also carried by the majority of the patrol officers on the show, which includes Officer Kim Burgess (Marina Squerciati).
Derek Keyes (Bokeem Woodbine) is seen using a custom two-tone Colt Officer's ACP, sometimes with a suppressor. The Officer's ACP is a newer model with Novak-style sights, flared magwell, slanted slide serrations, skeletonized hammer and trigger, and ambidextrous safety.
Error creating thumbnail: File missingMk 18 Mod 1 with Crane stock, KAC back-up iron sights, EOTech XPS3, AN/PEQ-15 ATPIAL, vertical foregrip, and dual pressure activation switch - 5.56x45mm NATO
In certain episodes this season you can see some of the members of Intelligence unit use MK 18 Mod 1 with Magpul CTR Stocks, gen 3 pmags, and flip up sights with various different Eotech reflex sights
Shotguns
Remington 870 (Breacher)
A Remington 870 shotgun fitted with a pistol grip, breaching muzzle, and saddle shell holder is used by Alvin Olinsky (Elias Koteas) in "Life is Fluid" (S3E01).
