The Beretta 92FS is the standard sidearm used by law enforcement in Chester's Mill, notably used by Deputy Linda Esquivel (Natalie Martinez).
Beretta 85F (Nickel)
In "The Fire" (S1E02), Peter (R. Keith Harris), Julia's Husband, is seen drawing what appears to be a nickel Beretta 85F on Barbie before being killed. It is stainless steel construction with single stack magazine.
SIG-Sauer P226
Dale "Barbie" Barbara (Mike Vogel) carries around what appears to be a SIG-Sauer P226 in his glove box. In "The Fire" (S1E02) he shoots and kills the husband of Julia (Rachelle Lefevre) in a struggle using this gun.
A police officer pulls a Heckler & Koch USP when Barbie tries to escape from the police station in "Cuartains" (S1E13).
Revolvers
Smith & Wesson Model 60
Waylon Dundee (Linds Edwards) uses a Smith & Wesson Model 60 to steal the Julia's car in "Imperfect Circles" (S1E07).Maxine Seagrave (Natalie Zea) is seen carrying a S&W 60 during "Speak of the Devil" (S1E11)
Shotguns
Mossberg 500AT
In "Manhunt" (S1E03), James "Big Jim" Rennie (Dean Norris) is seen carrying a Mossberg 500AT during a manhunt in the forest. In "Outbreak" (S1E04), Junior fires several warning shots in the hospital with the Mossberg 500.
Remington 870
In "The Fire" (S1E02), Paul Randolph (Kevin Sizemore) is seen drawing a customized Remington 870 which he pulls from the trunk of his car.
Ithaca 37
In "Thicker Than Water" (S1E08), Ollie Dinsmore (Leon Rippy) tries to kill Big Jim with a Ithaca 37 after capture him on his farm.
In "Manhunt" (S1E03), Paul Randolph (Kevin Sizemore) steals an Colt M4 with supressor from the police station and then uses it to defend himself in the forest. Junior Rennie (Alexander Koch) uses a Colt M4 to ambush Clint Dundee in "Imperfect Circles" (S1E07).
Ruger Mini 14
In "Manhunt" (S1E03), Barbie (Mike Vogel) carries a Ruger Mini 14 "Ranch Rifle" with a black synthetic stock while on a manhunt. You can tell the rifle was made earlier than 2005 by the sights.
Sniper Rifles
Remington Model 700BDL
Big Jim (Dean Norris) uses a Remington Model 700BDL to shoot at a propane truck in "Imperfect Circles" (S1E07). In "Thicker Than Water" (S1E08), Jim carries a Remington 700BDL when he enters in Ollie's farm. In "Speak of the Devil" (S1E11), Junior (Alexander Koch) is briefly seen with a Remington Model 700BDL in his house.
Remington 700SPS Tactical
In "Thicker Than Water" (S1E08), one of Ollie's men holds a Remington 700 SPS rifle.
M1 Carbine
Agatha Seagrave (Mare Winningham) uses a M1 Carbine to threaten Big Jim in her house during "Let the Games Begin" (S1E10). Later, Jim takes the rifle and uses it to threaten Agatha.