When the first Star Wars movie came out, it surprised and delighted fans, as well as studio executives that had pretty much written it off. Now it is part of pop culture. However most of the weapons used were based upon real guns, below are some of them.
First up, Jawa ionization blaster. It was a Enfield rifle cut down with a cup grenade launcher attachment added. And like all these props, they had parts of wires, kit and bits to disguise them.
Image source, Internet