Just a thought about hybrids
See a turbojet engine as a continuous hybrid. Making a Jet-Hybrid could be fun if you manage to find projectiles that doesn't melt, a chamber that can take a continuous hybrid combustion...
Well, ig you have access to high grade stainless steel machining....make it handheld
Well, ig you have access to high grade stainless steel machining....make it handheld

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."