Thanks to a fellow collector I was able to try out a vintage missile similar to the one that goes with this gun and it fires and flies like a champ! I will include this missile which is a smaller size than the original but works well.
Some paint loss and mildew stains. One small crack that runs about 2 (see last photo) but doesn't affect any function. The item "Vintage Rare Mattel LOST IN SPACE ROTO-JET Roto Jet Toy Gun WORKS" is in sale since Monday, October 19, 2020. This item is in the category "Toys & Hobbies\Robots, Monsters & Space Toys\Space Toys\Pre-1970".
The seller is "supervintagewhse" and is located in Heath, Ohio. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay, Philippines, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands.