Plastic vintage toy ray guns have their place... but not here.
The ray gun prop pictured here is something I put together using several retro style water pistols, a pvc pipe connector and some o-rings. The body is filled with dozens of small steel hex nuts, polyvinyl compound and hot glue for weight. The exterior was evenly coated with several layers of flat black spray paint and then treated with a bright metallic buffing compound. The result has more solidity and believability than any of those antique hollow metal or plastic mass produced toy ray guns. - Considering that some of those vintage toys can cost up to six hundred dollars a pop, it's a much more affordable option too.