Though he carries a Browning Hi-Power throughout the film, Bobby Burns switches to a Beretta 92FS during a gun fight in the street.
Smith & Wesson Model 13
FBI Special Agent Arthur Kressler (William Forsythe) carries a Smith & Wesson Model 13 with a 3" Barrel. Standard issue for F.B.I. agents in the late eighties.
Smith & Wesson Model 15
The female cop (Trudy Forbes) after the gunfight in the street carries a Smith & Wesson Model 15.
Smith & Wesson Model 10
Used by Chief Hillard (Brad Sullivan) and the rest of his deputies.
Smith & Wesson Model 28
Carried by the LAPD in the background during the scenes in Los Angeles.
Used by Bobby Burns (Frank Military) and other members of his group during the film.
Micro Uzi
Used by Sleepy (Mickey Jones) as well as other members of Burns' gang.
Uzi
The only time we see a full sized Uzi is when FBI Agent Kressler uses it in the assault on the cave complex.
Colt Model 653
Some of Chief Dixon's deputies carried the 14" barreled AR15 carbines, most likely the Colt Model 653.
M16A1
Used by Burn's gang, however, screenshots are hard since when used, they are all running and firing from a distance.
AK-47
Guards at the Aryan compound all carry full stock AK47 rifles. They don't have the chinese AK hoods so they are true AK47s or accurate clones.
Type 56-1
Sleepy (Mickey Jones) also carries a Norinco Type 56-1 Underfolder AK during the fight at the abandoned house.
Steyr AUG
Only seen on a table full of weapons at the press briefing.
Winchester Model 70
Used by Chief Dixon's Deputies.
Unknown Scoped Rifle
Bobby Burns (Frank Military) uses a scoped rifle. Make and model as of yet undetermined.
Ithaca Model 37
An Ithaca 37 is seen mounted in the squad car driven by Chief Hillard (Brad Sullivan) and later used by Jerry Beck (Don Johnson) at the gunfight at the abandoned house.
Unknown Rifles
Chief Elton Tremmel (William Traylor) has a variety of weapons hanging on the wall or in his gun cabinet (makes and models to be determined).
The one on the bottom looks like a Winchester High Wall. - Gunmaster45
"Fake" M1919 Flash gun
Burns (Frank Military) uses an acetylene firing 'fake' M1919-style weapon from the back of a station wagon during his escape.
Special
Trivia
A bit role for a Los Angeles County Sheriff deputy is a young Garwin Sanford who would later play Narim (from the Tollan people) from Stargate: SG1