One of Fletcher's goons carries a Smith & Wesson Model 681. Also, during the Gandhi II trailer, a street thug is seen with a Model 681, likely the same weapon.
Submachine Guns
Heckler & Koch MP5A3
During the Gandhi II trailer, Gandhi (Jay Levey) is seen using a H&K MP5A3.
Assault Rifles
Norinco Type 56
During the Rambo parody near the end of the movie, George ("Weird Al" Yankovic) imagines a stereotypical action-movie villain who shoots at him with a Norinco Type 56.
AK Variants
A group of soldiers armed with Kalashnikov rifles are seen near the end of the Rambo parody. As we are never given anything other than a long distance view of the weapons, it is impossible to determine if they are genuine AK-47s or AK clones.
Machine Guns
Browning M2
Two Browning M2 machine guns can be seen during the Rambo parody, the first mounted on a jeep, the second behind a barricade.
M60 Machine Gun
During the Rambo parody, George ("Weird Al" Yankovic) uses an early model M60 machine gun (Rambo's iconic weapon from First Blood). The muzzle flashes were obviously added post-production, as he uses it without any sort of ammunition.