Skeleton Man is a 2004 sci-fi/horror movie starring Casper van Dien and Michael Rooker. The film concerns an undead, Grim-Reaper-style killer who stalks a group of mercenaries. The movie seems to rip quite a few elements from Predator.
The following weapons were used in the film Skeleton Man:
Security personnel use M16s in the first plant that Skeleton Man assaults. Some members of the Special Forces squad also carry it.
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AK-47 Derivative
The helicopter that provides fire support for the team has two gunners, the first of whom carries an AK-47 derivative.
Quite a few characters are armed with this weapon, including a soldier running from the Skeleton Man, a few members of the Special Forces team and the power plant security personnel.
A worker who confronts the Skeleton Man at the film's beginning appears to be armed with a Remington 870 shotgun with a sawed-off barrel and pistol grip.
Used by most of the Special Forces, as well as in law enforcement hands. The power plant security personnel also have it when they confront the killer.
Towards the climax, Leary booby traps certain passageways in the power plant with M67 grenades to halt Skeleton Man's advance. The device is also seen earlier when he fashions a landmine.