My apologies,joberg,I realize that Micheal Rennie is virtually the "Grand Old Man" of hollywood sci-fi/alien movies...He just kind of got lumped in there with the other "kids". MR ...
A bit of insommniac Google searching and...Viola!...I at least found some decent images of some of the "vaporizing gun(s)" used in The Invaders television series. Here`s a few links in case ...