Issued to John Rambo (Sylvester Stallone) by his CIA controllers is a Heckler & Koch MP5A3. He loses the weapon when he is forced to cut away his equipment when his parachute rigging gets caught up during insertion. When he is first seen loading it up, it is fitted with a 3x scope, but when he prepares for the drop, it appears to have been removed. Like many other "MP5A3s" at the time, this gun is actually a chopped and converted HK94.
Heckler & Koch HK93
A Vietnamese soldier is seen armed with an H&K HK93 rifle while watching from a tree. It is far more likely to be an HK93 over an HK33 because Stembridge gun rentals had many in stock at the time and they were easier to acquire over the selective fire HK33 variant.
Valmet M78
A Vietnamese soldier is seen armed with an Valmet M78 rifle in a tree. It appears to be dressed up like an SVD Dragunov by adding the infamous thumb-hole stock and being fitted with a scope.
AKM
When Rambo first lands in Vietnam, he meets up with Co Bao (Julia Nickson-Soul) who is armed with an AKM. Rambo later picks up a few AKMs throughout he film to dispatch several enemy Vietnamese and Russian soldiers. Vietnamese and Russian troops are widely seen armed with AKMs as well. As in most Hollywood movies, the AKMs in the film are all Egyptian Maadi ARM copies of the original Soviet AKM(Much like in Red Dawn).
Poly Tech Legend AK-47
One of the Russian soldiers is seen with a genuine AK-47, likely a Poly Tech Legend AK-47 rifle, although this may have to be confirmed due to sketchy time era.
We seriously need a good picture of a PT Legend. Don't use that picture of an original Type I Soviet AK-47 because the PT Legend looks nothing like that.
Yeah, I know. I was just using what I had to work with. Lets ask MPM2008 and add a thousand and ONEth gun to his to-do list. I wish I had his high tech goodies so I could help him out. I just screencapped the entire Rambo II film and still I feel useless. Ugh.
Haha, no worries. I seriously wish I could be more helpful as well.
M60 machine gun
The door gunner of the chopper sent to pick up Rambo is seen firing an M60 machine gun and killing several Vietnamese soldiers with it.
DShK(mock up)
When Rambo and the POWs are escaping in the fake Hind D(Which in reality is a French Aerospatiale Puma), another chopper flies up and begins firing at them with an M60D which looks to be dressed up to look like a aircraft model DShK heavy machine gun by being fitted with a semi-similair muzzle break and spade grips.
M60E3
When Rambo flies the POWs out of the prison camp in a Bell UH-1 Huey (possibly a Vietnamese one (due to the VPA making use of former ARVN weapons and vehicles after the Fall of Saigon in 1975) on loan to the Soviets), he lands the chopper and picks up an M60E3 machine gun from the chopper door. He later empties it in the the command center to destroy all the high tech equipment and scare Marshall Murdock (Charles Napier) for betraying him.
Ingram MAC-10
When Co Bao disguises herself as a prostitute to save Rambo, she uses a MAC-10 with a mock-suppressor to fend off the Vietnamese troops. Somehow this film was nominated for a sound oscar despite how Rambo's AK spits out rounds at ~650RPM while her MAC-10 fires at ~1200RPM and both guns have the same report in the film.
Fake RPG-7
Rambo disposes of an enemy boat by pulling a fake RPG-7 (which appears like the armorers of Red Dawn, who did this film, brought it with them from that film, albeit more convincingly dressed up) out from under a compartment in the gun boat.
M72 LAW
When Rambo crashes his chopper, the enemy helo flies over to confirm the crash. Rambo plays dead until they fly over fires (with the safety on) an M72 LAW launcher through the windshield and blows them up. It should be noted that the back blast would have likely killed or wounded all the POWs in the back of the chopper.
Rambo's Survival Knife
While not a gun, we let Rambo's knife stay because, well, he's Rambo and his knife completes him.
Hoyt Archery Rambo compound
Another non-firearm Rambo gets away with, his Hoyt Archery compound bow which has been well know as the "Torque Bow" because of the high explosive arrow tips he fires from it.
Remington 870
A Vietnamese pirate can be seen wielding a Remington 870 shotgun with a wooden forend, extended magazine tube, and folding stock. Rambo (Sylvester Stallone) fires a few rounds at the pirates with the shotgun.
Dual Browning M3 anti-aircraft
An opposing Vietnamese gunboat begins to blow apart the gunboat Rambo is on with dual mounted Browning M3 anti-aircraft .50 caliber guns noted by their perferated barrel shrouds.
M16A1
Some Vietnamese troops guarding the boat and docks are seen armed with M16A1 rifles.
M16A1 w/ A2 handguards
A Vietnamese soldier can be seen with an M16A1 fitted with A2 handguards on the boat docks.
MGC M16 Replica
Next to the RPG-7 stored in the boat is an MGC M16 replica rifle.
GE M134 Mini-Gun
Seen mounted on the left side of the fake Hind D is a GE M134 Mini-Gun which is electrically fired by Rambo at the controls and is then manned by one of the POWs who managed to kill a Russian chopper door gunner with it.
Yugoslavian M57
Seen as the sidearms of all the Vietnamese soldiers is the Yugoslavian M57, the Yugo copy of the Russian Tokarev TT-33, which was in short supply at the time. The Chinese Norinco Type 54 would be more accurate for them to use for the film, which would be noted by a frame mounted safety switch (which these all lack).
M67 "Baseball" grenade
When escaping the Vietnamese camp, Rambo grabs a bag of M67 "Baseball" Grenades and uses them against the soldiers.
SIG-Sauer P226
The door gunner pulls out a SIG-Sauer P226 pistol and holds it to Colonel Trautman (Richard Crenna) when he tries to stop the chopper from leaving Rambo. It is noted a P226 by its double stack creases on the frame. The P226 was a brand-new pistol on the American firearms market in 1984-85, when the film was made, so it is likely that Rambo: First Blood Part 2 is the very first movie to feature this gun (it was previously stated on IMFDB's RoboCop page that RoboCop was likely the first movie to feature a P226).
M29 81mm Mortar
When Rambo, Co Bao, and the POW run throught the rice paddy field, Vietnamese soldiers drop M29 81mm Mortars across the field at them but don't score a hit.
M1911A1
One of the Vietnamese pirates on the gun boat has an M1911A1 pistol in his holster and puts his hand on it when Rambo and Co Bao enter the boat.
Trivia Specials
The Soviet uniforms are US type 'Duck Hunter' fatigues dyed blue to look Russian.
The "Mil-24" is an Aerospatiale Puma from the movie Red Dawn, but modified again to look like a later variant.