Sheriff Riley (John Schneider) (of Aroostook Maine) uses a Cobray M79LF 37mm Flare Launcher mocked up with a fake scope and an added on cylindrical drum (making it look a lot like a Sentinel Arms Stryker), which is refered to in the film as a "Milkor MG-340", and supposed to be a grenade launcher. At one point, we even see Riley open up the tube of the launcher, which moves the drum along with it.
Franchi SPAS-12
The big game hunter/poacher Struthers (Sam McMurray) carries a Franchi SPAS-12, which he even refers to as a Franchi SPAS-12 in the film. He also mentions how the acronym stands for "Sporting Purpose Automatic Shotgun". His tube magazine is shorter than standard, appearing to hold less than the standard 9 shot tube of the SPAS-12. He only uses it once and changes over to the Browning A Bolt Shotgun for the rest of the film.
Mossberg 500 Persuader
Sheriff Riley (John Schneider) is seen carrying a Mossberg 500 Persuader at one point in the film, in which Struthers brags his SPAS-12 is bigger. Riley rarely uses the Mossberg, instead going for the fictional 40mm grenade launcher for the rest of the film.
Beretta 92FS
Struthers (Sam McMurray) carries a Beretta 92FS pistol as his sidearm, as does Sheriff Riley (John Schneider). The gun appears to be a flashpaper gun, but since other guns in the film fire blanks, it can be assumed it was due to lack of a better prop instead of sound ordinance.
Browning A-Bolt
Struthers (Sam McMurray) brings several Browning A-Bolt, although it is rather useless to use without a scope or sights. The bore and magazine plate indicates it is the shotgun version, which is a rare version of the A-Bolt no longer in production, and the production has at least two of them. Struther's assistant Ahmad (Joe Holt) carries it when Struthers carries the SPAS-12. Emily (Sarah Lafleur) and Sheriff Riley (John Schneider) also uses the gun.
Marlin 336C Carbine
Seen in the Aroostook Sheriff's office stacked against a wall.
The gun actually looks like a Winchester 1894, not a Marlin. - Gunmaster45
good point. I put both of them together for a side by side analysis. MPM
Unknown Double Barreled O/U Shotgun
Seen stacked against the wall behind Frank as he makes his statement.
Steyr Mannlicher M95/30 short rifle
Seen stacked against the wall behind Frank as he makes his statement.