![MBAssociates Gyrojet pistol, carbine and rifle - Fired 12mm or 13mm rocket projectiles. Turned out to be a commercial failure. Unfired rounds (if they can be found), can cost as much as MBAssociates Gyrojet pistol, carbine and rifle - Fired 12mm or 13mm rocket projectiles. Turned out to be a commercial failure. Unfired rounds (if they can be found), can cost as much as](https://preview.redd.it/s7m68srs9kf61.jpg?width=1080&crop=smart&auto=webp&s=eaf4dfcb9a56d5512ec7b83d54f59cf0db366659)
MBAssociates Gyrojet pistol, carbine and rifle - Fired 12mm or 13mm rocket projectiles. Turned out to be a commercial failure. Unfired rounds (if they can be found), can cost as much as
![13 mm Gyrojet, Three Nozzles/Ports? - General Ammunition Discussion - International Ammunition Association Web Forum 13 mm Gyrojet, Three Nozzles/Ports? - General Ammunition Discussion - International Ammunition Association Web Forum](https://global.discourse-cdn.com/business6/uploads/cartridgecollectors/original/3X/3/8/38b281d2ebf9bbaa90d4f7198f73e65bed26aea1.jpeg)
13 mm Gyrojet, Three Nozzles/Ports? - General Ammunition Discussion - International Ammunition Association Web Forum
![A Gyrojet Mark II mod. C rocket pistol Cal. 12 mm Gyrojet, no. 247. Bright 2-groove rifled bore, length 5". Total length approx. 9-1/2". Integrated magazine for six rockets. On left side A Gyrojet Mark II mod. C rocket pistol Cal. 12 mm Gyrojet, no. 247. Bright 2-groove rifled bore, length 5". Total length approx. 9-1/2". Integrated magazine for six rockets. On left side](https://c8.alamy.com/comp/T8NPHY/a-gyrojet-mark-ii-mod-c-rocket-pistol-cal-12-mm-gyrojet-no-247-bright-2-groove-rifled-bore-length-5-total-length-approx-9-12-integrated-magazine-for-six-rockets-on-left-side-of-weapon-housing-marked-mbassociates-san-ramon-calif-mark-ii-model-c-12-mm-gyrojet-on-right-side-marked-us-pat-3412641-weapon-housing-has-aluminium-zinc-alloy-with-black-anodised-surface-operational-parts-chrome-plated-smooth-walnut-grip-panels-in-original-cardboard-box-new-presumably-unfired-erwerbsscheinpflichtig-historic-historical-civil-additional-rights-clearance-info-not-available-T8NPHY.jpg)