The most prominent weapon in the film, the Spectre M4 SMG is carried by Valkenvania Police Chief Constable Dennis Valkenheiser (John Candy), and used by Constable 'Miss Purdah' (Valri Bromfield). The Spectres in this film have the foregrips and folding-stocks removed.
What appears best to be a Smith & Wesson Model 659 pistol is carried by Miss Purdah in one of her dual reverse-draw holsters - Best seen in the larger shot of when she aims her CAR-15 alongside her vehicle.
Of course, the pistol in Miss Purdah's other holster. As it's farther away and at an angle it makes identification difficult. It's possibly a different weapon than the S&W 659 on the left holster.
During a stop, Arthur (Daniel Baldwin) pulls a nickel-plated Colt Python Snub-Nose on Dennis, though it gets quickly knocked out of his hand. It is seen again a bit later on the desk of Judge Alvin Valkenheiser (Dan Aykroyd).
Interestingly enough, later in the film, Miss Purdah carries what appears to be an actual XM177E2 rifle. Perhaps standing in for the CAR-15.
Error creating thumbnail: File missingXM177E2 Carbine aka Colt Model 629 - 5.56x45mm. This was the last variant of the XM177 rifle used in the Vietnam War.Error creating thumbnail: File missing'Right this way, Mr. Snappy-Comeback.' Miss Purdah wields an XM177E2 (or at least, an awfully close lookalike) as she orders Chris to leave the room.Error creating thumbnail: File missingThe XM177E2 is seen slung on Miss Purdah's back. Note the notch before the flash hider, and the somewhat short and thick flash hider/suppressor itself.
Walther PPK
Alvin's personal weapon appears to be a stainless Walther PPK pistol. The PPK pistol in this film appears to have engraving on the slide and white (Possibly Ivory) grips.
Towards the end of the film, some State Police Troopers carry what appear best to be standard Mossberg 500AT shotguns (wooden furniture), which I figure mainly because of the dual-action bars.
