A Manmelter 3600ZX raygun replica based on Weta Workshop's Dr Grordbort's Raygun line (https://www.wetanz.com/shop/weapons/manmelter-3600zx)
Made from MDF, styrene sheet and tube, amongst other doodads. Featuring a spring-loaded trigger, toggle switch, and swish-able blue liquid.
Scaled from the photos and measurements on the Weta website.