The whitephysgun.zip file you have requested: Skins / Weapons / Half-Life 2: Garry's Mod White Phys Gun - 680.57kb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:
This is a white physics gun. I had originally made the skin for the physcannon, but I hadn't released it (I might if anyone still wants it). Also, it has a custom beam that by default, constantly changes colors very fast (so does your original beam, A white Phys Gun model that comes with the custom beam that changes color.