Designed as a carbine version of the MBA Mark I Gyrojet Pistol and utilizing the same 13 mm solid fuel rocket ammunition. The carbine has a vague resemblance to an AR type carbine with a high flat-top front sight, fixed carry handle with Williams adjustable rear notch sight, full aluminum construction, full length handguard, contoured pistol grip, and buttstock with smooth plastic buttplate. The left side of the receiver is inscribed "EXPERIMENTAL/MARK I/GYROJET/ROCKET/CARBINE" over the serial number. Like the pistol version, the magazine is fixed in the grip, and the hammer works in reverse, driving the round backwards into a fixed firing pin. Includes leather sling. This carbine along with a Gyrojet pistol with the same serial number, lot 591, were both originally shipped to a Dr. Robert D. Taylor who was friends with the heads of MBA. Dr. Taylor is listed as the owner of this carbine as well as the pistol in the Gyrojet census on gyrojet.net.

Excellent, retains 99% plus original black anodized finish with some small scattered scratches. The fire controls have turned to a brassy/copper patina. The wood is also excellent with a few small dings. Mechanically excellent.