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Description
Gyrojet technology as it should have been! Rockets aren't suited for a handgun, but out of a long gun they work just fine.
Lightweight! Low pressures mean the weapon is constructed almost entirely of aluminum and polymer.
Simple! The firing cycle is just a hammer striking the front of a rocket, forcing it back into a firing pin to ignite, fly forward and re-   cock the hammer. No complicated extraction or ejection. This also allows for very high fire rates should that be desired.
Cheap! The weapon's simplicity and lightweight materials make it incredibly cost effective (the ammunition on the other hand...)
Low recoil! The use of rockets which burn most of their propellant outside the barrel means the user experiences almost zero   recoil. For the same reason, there is very little heat buildup in the weapon.
Quiet! Firing produces only a slight hissing noise, like opening a soda can, while rounds break the sound barrier further downrange.   No suppressor required.
Packs a punch! Rocket ammunition achieves approximately 50% greater velocities than comparable conventional ammunition.

The Tellus Rocket Carbine fires 13mm rockets from a 28 round box magazine, which uses a constant force roller spring for easy loading. The magazine features closed top feed lips which contain the rockets and feed them up to right in front of the end of the barrel, allowing the wide hammer to push back on the nose of the rocket, causing it to strike one of the two firing pins to the rear (one for either position in the double stack magazine) and ignite, flying forward and re-cocking the hammer.
For use with a double stack magazine, the aluminum barrel is a sort of figure eight shape (called "vesica piscis) to enable firing from either feeding position. In order to protect the vent ports of the ammunition from debris, the magazines usually feature a thin foil cover over the holes in front and behind the rockets being fed, which is broken by the hammer when firing.
Additionally, the carbine is designed so that inserting a magazine automatically cocks the hammer, simply load and fire, though a small external handle is available to manually charge the weapon in case of a failure to fire.

Rocket ammunition continues to accelerate after leaving the barrel. The carbine's 13mm rounds reach 253m/s after 0.08 seconds, having travelled just over 10 meters. At 0.23 seconds the round is travelling at 723m/s and has travelled 30 meters, and at 0.44 seconds the round reaches its top speed of 1383m/s and has travelled 55 meters.

Ammunition is available in standard slugs, armor piercing, high explosive (akin to German B-Patrone or Soviet PZ, only more), and high explosive-armor piercing.

In addition, because the weapon lacks any firing/ejecting cycle other than re-cocking the hammer, there is also a three-barreled volley gun version of the carbine similar to the TKB-059, which can produce truly tremendous rates of fire.

While the visual designs are mine, basically all the credit for the ideas behind the Tellus rocket guns goes to Yoel from Future War Stories.

Description
Gyrojet technology as it should have been! Rockets aren't suited for a handgun, but out of a long gun they work just fine.
Lightweight! Low pressures mean the weapon is constructed almost entirely of aluminum and polymer.
Simple! The firing cycle is just a hammer striking the front of a rocket, forcing it back into a firing pin to ignite, fly forward and re-   cock the hammer. No complicated extraction or ejection. This also allows for very high fire rates should that be desired.
Cheap! The weapon's simplicity and lightweight materials make it incredibly cost effective (the ammunition on the other hand...)
Low recoil! The use of rockets which burn most of their propellant outside the barrel means the user experiences almost zero   recoil. For the same reason, there is very little heat buildup in the weapon.
Quiet! Firing produces only a slight hissing noise, like opening a soda can, while rounds break the sound barrier further downrange.   No suppressor required.
Packs a punch! Rocket ammunition achieves approximately 50% greater velocities than comparable conventional ammunition.

The Tellus Rocket Carbine fires 13mm rockets from a 28 round box magazine, which uses a constant force roller spring for easy loading. The magazine features closed top feed lips which contain the rockets and feed them up to right in front of the end of the barrel, allowing the wide hammer to push back on the nose of the rocket, causing it to strike one of the two firing pins to the rear (one for either position in the double stack magazine) and ignite, flying forward and re-cocking the hammer.
For use with a double stack magazine, the aluminum barrel is a sort of figure eight shape (called "vesica piscis) to enable firing from either feeding position. In order to protect the vent ports of the ammunition from debris, the magazines usually feature a thin foil cover over the holes in front and behind the rockets being fed, which is broken by the hammer when firing.
Additionally, the carbine is designed so that inserting a magazine automatically cocks the hammer, simply load and fire, though a small external handle is available to manually charge the weapon in case of a failure to fire.

Rocket ammunition continues to accelerate after leaving the barrel. The carbine's 13mm rounds reach 253m/s after 0.08 seconds, having travelled just over 10 meters. At 0.23 seconds the round is travelling at 723m/s and has travelled 30 meters, and at 0.44 seconds the round reaches its top speed of 1383m/s and has travelled 55 meters.

Ammunition is available in standard slugs, armor piercing, high explosive (akin to German B-Patrone or Soviet PZ, only more), and high explosive-armor piercing.

In addition, because the weapon lacks any firing/ejecting cycle other than re-cocking the hammer, there is also a three-barreled volley gun version of the carbine similar to the TKB-059, which can produce truly tremendous rates of fire.

While the visual designs are mine, basically all the credit for the ideas behind the Tellus rocket guns goes to Yoel from Future War Stories.