A product of the 1960s, the Mark I Gyrojet uses a miniature solid fuel rocket in place of a standard cartridge. As the rocket does not need a solid chamber or extractor equipment, the entire pistol can be greatly simplified and made from lightweight materials. Elevation adjustable blade front and fixed notch rear sights, a sliding magazine cover, front-mounted hammer, cast model, caliber and serial number markings on the left side, and a pair of smooth grips. With a hardwood MBA display case, Robert Hutchings Goddard plaque, and ten spent rounds of Gyrojet ammunition.