The Beretta 92FS is the main service pistol for many police officers in the show, including Detective Curtis Lemansky (Kenneth Johnson), Officer Danni Sofer (Catherine Dent), and Officer Julien Lowe (Michael Jace).
Beretta Jetfire
In Season 3's premiere "Playing Tight" (S3E01), a Beretta 950 Jetfire is taken off a gang member by Shane and given to Vic.
In "Mum" (S3E04), Lou-Ann Klopp (Peggy Miley) holds an M1911A1.
Revolvers
Smith & Wesson Model 19 Snubnose
Det. Claudette Wyms (CCH Pounder) carries a Smith & Wesson Model 19 snubnose revolver as her sidearm. She notably draws her revolver in "Mum" (S3E05).
Smith & Wesson Model 10
In "Streaks and Tips" (S3E04), Shane finds a Smith & Wesson Model 10HB hidden in a pawn shop. He then gives the revolver to Det. Tavon Garris (Brian White).
Smith & Wesson Model 640 Centennial
Detective Vic Mackey also carries a snub-nosed Smith & Wesson Model 640 Centennial as a backup weapon, notably in Season 3's premiere "Playing Tight" (S3E01).
Shotguns
Mossberg 500
Uniformed officers are seen armed with the Mossberg 500 throughout the series.
Submachine Guns
Heckler & Koch MP5A3
In Season 3's premiere "Playing Tight" (S3E01), a cache of Heckler & Koch MP5A3 are seized during a raid. The Strike Team is seen using several of the weapons to take down a suspect.
Heckler & Koch MP5A2
The Strike Team seize a large number of MP5's and later dump them into the ocean in "Blood and Water" (S3E02).