Return of the Living Dead Part II
The following weapons were used in the film Return of the Living Dead Part II:
MGC Replica M16
Visible throughout the film when not firing are the MGC Replica M16 rifle from Japan.
When seen firing most of the American soldiers use M16A1 rifles. Most notably at the blockade at the bridge.
One of the soldiers in the film is using an AR15 variant with a heavy barrel and A2 handguards. We don't see the ejection port side of the rifle so we cannot determine if it has a brass deflector, but the rear sights are definitely A1 style. During the 1980s, many barreled uppers from other manufacturers were commercially available and were mated to either Colt lower receivers or lower receivers made by other companies, like Bushmaster. It is designated as an AR15 variant in that the actor only fires semi auto.
M60 machine gun
The M60 Machine gun is first seen at a road blockade, mounted again on a jeep, which is parked in front of an M60 tank. It is later seen when two soldiers confront the horde of zombies and fail to stop them. The Sarge in charge of the M60 is a young Mitch Pileggi of X-Files fame.
Remington 870 Field Gun
George Crowley (Don Maxwell) bring out a Remington 870 Field Gun when he hears his trash cans being knocked over by Ed and Joey. However he gets eaten before he has the chance to use it. Another Remington field gun is seen in the gun cabinet that is raided by Lucy to acquire firearms.
Winchester Model 70
Seen briefly in the gun cabinet that Lucy raids for firepower.
Double barreled shotgun
Lucy acquires a 12 Gauge Double Barreled Shotgun which she uses to sever a zombie's upper from his lower half.
Winchester Model 62
Jesse is given a Winchester Model 62 rifle by his sister, Lucy, but abandons it in favor of something with more firepower.
Tom is given an M1911A1 to use, but it's only loaded with three rounds.
Smith & Wesson Model 27/28
Jesse selects a Smith & Wesson Model 27 / 28 to use against the zombies after rejecting the Winchester Model 62. However he only gets off one shot before the recoil knocks the gun out of his hands and under a cabinet. It is heavily implied that the revolver is a .44 magnum in the script, however, multiple viewings of the revolver reveal that the cylinder holes and barrel opening are too small to be a .44 magnum. Also the size of the revolver in the boy's hands are deceptive. The smaller .357 magnum revolver seems to be the one used. It could be either the Model 27 or Model 28 (depending on finish).
An M2 Flamethrower is used by a soldier at the power plant.
Kentucky Flintlock Pistol
A Kentucky Flintlock pistol is seen in the gun cabinet that Lucy raids for guns. It is only really visible when Jesse Wilson reaches for the revolver.