Lost In Space Season 1 laser pistol (the one Icons replicated) is a modifed remco toy pistol

Robocop's gun (BFG-1) is a modified Beretta m93-R with a fiberglass barrel extension and additional minor aesthetic modification. The Beretta M-93R is a unique pistol in that it has a trigger area unusually large for a pistol and that it can be affixed with an optional shoulder strap. Visit this sites Robocop Pages for more info on the gun

Blade Runner Decker's Gun was made from a modified sawed off rifle, more info at www.racprops.com

Chewbacca's Laser Crossbow And Other non light saber Star Wars weapons are almost all modified commercially available weapons. Visit http://www.collectorsempire.com/parts/Main.htm for more info about the weapons that were modified for use in Star Wars.

The Terminator's infamous 45 long slide pistol actually included a custom made scope which did not even function well.

Aliens Pulserifle modified Thompson machine gun

Alien 4 auroga pistol was made by modifyng an unknown pistol most like a beretta model of some sort.