The following firearms were used in the movie Scrooged:
Two full-length M16A2 rifles are seen in Santa's armory and are later used by Santa and Mrs. Claus in the promo for the proposed television special The Night the Reindeer Died.
Several Colt XM177 lookalike rifles can be seen in Santa's armory.
A M60 machine gun can be seen in Santa's armory and is used by two of the elves.
GE M134 Minigun
Lee Majors (playing himself) uses a hand-held M134 Minigun with a M60 handguard in the promo for The Night the Reindeer Died. This minigun configuration appears to be identical to the one used in the film Predator.
Heckler & Koch MP5K
The terrorists who attack Santa's workshop in The Night the Reindeer Died carry H&K MP5K submachine guns, which can be identified only in one brief shot where the silhouette of one is visible.
Sawed-Off Double Barreled Shotgun
During Frank Cross' overly-effective trailer for the Scrooge TV special, a man can be seen committing a drive-by shooting with a sawed-off double-barreled shotgun.
Smith & Wesson Model 60
Double Barreled Shotgun
Eliot Loudermilk (Bobcat Goldthwait) barges into Cross' office with a double-barreled shotgun near the end of the movie. Notably, he fires three shots between when he enters Cross' office and when he first reloads.