The firearms used in the 1990 film Air America include the following...
M16A1
M16A1 with 20 round magazine - 5.56x45mm. What distinguishes it from the original M16 was the addition of a raised rib around the magazine release button, changing of the forward Receiver pins, and the addition of the forward assist button on the upper receiver.
M1911A1 pistol
World War 2 issued Colt M1911A1 Pistol - .45 ACP.
M60 machine gun
M60 machine gun 7.62x51mm NATO
M1 Garand
M1 Garand semiautomatic Rifle with leather M1917 sling - .30-06
M1 Carbine
Korean War Era
M1 Carbine, with Birch Stock, Adjustable sight and bayonet lug. Most of the World War 2 variations of the M1 Carbine were sent back to the Military Arsenals and retrofitted with the Bayonet Lug and adjustable rear sight. This is the version seen after last 1945 and all the way until the 1960s. This version is seen most often in World War 2 movies, despite being anachronistic for most World War 2 battles.
Uzi submachine gun
AK-47
PPS-43
Unknown Rifle/Shotgun
Flintlock Rifle