A two-tone Beretta 92FS was used by a thug in "Bears will be Bears" after being attacked by Eddy in his Bludbad form.
Glock 17
Detectives Nick Burkhardt (Dave Giuntoli) and Hank Griffin (Russel Hornsby) are armed with 2nd Generation Glock 17s as their standard sidearm. This is correct since the Portland Police Department standardized the Glock 17 as one of the sidearms allowed for use by all of their officers.
Smith & Wesson 5906
Used by Orson (Daniel Roebuck) in "The Three Bad Wolves" when he assassinates Hap as part of an ongoing family feud between Blutbads and Bauerschweins. It was also used initially with a suppressor mounted on the barrel. He was about to use it on a wounded Angelina when Nick disarmed Orson by taking the pistol away from him.
Revolvers
Smith & Wesson Model 27
Gilda Darner (Amy Gumenick) arms herself with a Smith & Wesson Model 27 revolver in "Bears will be Bears" after getting bail, taken from Rocky Babb's room.
Shotguns
Mossberg 500
A Mossberg 500 with black plastic furniture was used by Orson when he confronted Monroe in his house in "The Three Bad Wolves".
Assault Rifles
Colt M4A1
Oregon Police SWAT officers are armed with the M4A1 in "Game Ogre" when they raiding the apartment of a suspect.