![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://i.redd.it/s7m68srs9kf61.jpg)
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
![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/9/8/980cfa2f6bafa3443a5c1825a574c6a4921c2b2b.jpeg)