A product of the 1960's, 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 aluminum. Elevation adjustable blade front and fixed notch rear sights, with a sliding magazine cover, front-mounted hammer, engraved model, caliber and serial number markings on the left side and a pair of smooth hardwood grips. With a MBA "Rocketeer" box hand-numbered to gun and papers.