A laser pistol was used by the crew of the USCSS Nostromo. Derived from the technology used in laser welders, the laser pistol was equipped with a 4x20 scope.
In June 2122, laser pistols were used by the crew of the Nostromo while investigating the derelict ship on LV-426. All of the Nostromo's laser pistols were destroyed when the ship's self destruct system detonated.
The laser pistol was a miniaturized, weaponized version of the laser welders used by Dennis Parker and Samuel Brett aboard the USCSS Nostromo. The pistols used by the Nostromo crew were equipped a 4x20 scope mounted on top of the weapon and an unknown device (possibly a laser guide) on the bottom. The pistols used by the crew of the Nostromo also had "NOSTROMO" and "LIGHT SYNC. DIAL" on the side in the right font Futura Demibold. Presumably, if the pistol were used on another ship, "NOSTROMO" would be replaced with the ship's name.
Some MK 50 Compression Suits in 2122 featured a holster for the laser pistol on their right leg.
Behind the ScenesEdit
In the original ending of Alien, Ripley was to find herself hanging outside of the shuttle Narcissus by a cable, with the Alien clinging to the end. Before climbing back aboard she was to shoot the Alien in the head with one of the laser pistols, only for it to have almost no effect on the creature. Storyboards were created for the sequence, but it was later simplified to the version seen on film.
Full-size props of the pistol were based on the Rexim-Favor submachine gun, with their barrels shortened, stocks and magazines removed, "NOSTROMO" and "LIGHT SYNC. DIAL" in the font Futura Demibold added to the side of the pistol used by Kane, 4x20 scopes added to the top and a Singe Point Scope (which was also used on blaster props in the Star Wars films) attached to the bottom of the magazine wells.
A second, smaller version of the pistol was also custom-made, based on a Webley Junior Mk.II air pistol by Webley & Scott. These props consist of a commercial Webley metal air gun with various production modifications, additional dressing including a metal tube with threaded plug in the gun barrel, an added arm and a sight-scope accessory on top, etc. The miniaturized versions were used by the children who played Dallas, Kane and Lambert in some long shots where the pistols were seen in the holsters on the suits' legs, and was scaled down to match their smaller suits. Three of the Webley props were constructed.