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It seems there are now two or three different ideas about this technology being discussed interchangeably here:
  • Light gas guns that use compressed gas to propel the projectile.
  • Light gas guns that burn the light gas to propel the projectile.
  • Gas fueled guns that use both a gaseous fuel and oxidizer via sudden combustion to propel the 'projectile'.
The last idea is somewhat similar to 'carbide cannons' or 'movie machine guns' I have seen in use, however those two do NOT employ any projectiles in firing. only propelling the burnt and unburnt gasses out rapidly to generate the loud 'bang' and a flame at the 'muzzle'.

Perhaps the middle idea may be a laboratory curiosity as I have never heard of one outside a Laboratory as getting mixed fuel and oxidizer gases to heavily compress before potential self ignition is a problem. Further, such combustion is like a 'detonation' rather than a 'controlled rate burn', very fast and sharp pressure rise to very high values that can over stress the chamber in which it occurs.

A slightly more 'controllable' idea is using liquid fuel injected into a chamber of compressed oxidizer gas. This idea has been very well developed over the last couple of centuries in diesel engines, supercharged spark ignition engines, and experimental cannons.

Chev. William
 

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The hyper-sonic light gas guns are two stage guns. They use a propellant to push a piston that compresses the light gas that accelerates the projectile. The advantage of these guns is that they can propel projectiles many times faster than any burning fuel. Originally they were used to study high velocity impacts of small objects in space but have been modified to study the potential as armament for military use.
This video will show how and why it was begun: 19 minute video on light gas gun development.
 

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Guns using chemicals as a propellant were an answer to matchlock and flint problems they got killed of by caps.
They got pretty good results compared to the black powder guns that were around at the time.
Much more than a curio , they were used by gentlemen hunters .
I am surprised that the tech was not developed.

cheers.
 

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No ignition and burn propellant can get velocities that the light gas guns get. Watch the movie to see how it was developed and why you won't find it in your local gun store.
 

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Iv seen a documentary about there meteorite cannon, pretty cool stuff.
Burning gunpowder is a convenient way to make gas’s.

cheers
 
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