the lasertag gun in question was the ESS (Electronic Survivor Shot) made by Hasbro I think (might have been Tomy though). Linited editions are still produced in Japan but you can find them in good will type places still in the US as several of my friends collect them.
While the general shape is similar the ESS was not used for the TEKWAR gun.
A little known part of the prop, rarely shown, was that the gun folded up for some inexplicable reason. The front and back slide closed over the grill part...
Man, 7 posts, no props...