In one of my stories ("Forgiveness"), I made reference to a bug-hunting weapon called a "scythegun." Following the story, someone asked a question about what these guns were and how they worked.
I never answered this because there is no definite answer. I figured not every hunter would be ill-equipped for the job--someone must have a gun that would "mow down" the bugs easily. This thought of mowing down is why I came up with the term "scythegun." Once I thought of it, I used it because I thought the word sounded cool. I never detailed what it was or how it worked. Such details were unimportant to the story I wrote at the time.
I figured if anyone else wanted to use a scythegun and explain how it works, he or she could make up whatever sounded plausible. I figured the term "scythegun" did not have to be linked to an actual scythe because it could be a sort of brand name, assuming brand names exist in the future world of Avenir Eclectia.
If you want me to make something up, I can do that on the spot: I heard once that a military engineer had an idea to link two cannonballs by chain and fire them from two separate cannons at the same time. The idea was the cannonballs linked by chain would form a line of destruction, not only killing what the cannonballs hit, but everything in between them that would be hit by the chain, hugely multiplying the potential destructive force. In practice, however, one of the cannons always fired slightly before the other, so that cannonball would arc around in a loop while the other ball was still anchored to the inside of its cannon. This proved fatal to cannon crews and effectively "killed" the idea.
So I'd make a scythegun a double barrel kinetic energy weapon, firing two small shotput sized balls linked by chain. A modern machine could time them so they come out at exactly the same time. This would punch two fist-sized holes in the bug's exoskeleton maybe 1 to 2 meters apart and cut through the tissue in between. That would effectively scramble the bug internal organs in an instant without breaking the exoskeleton into minute fragments as a large explosive projectile would do.
You could set it up so the scythegun fires one ball at a slightly faster speed (though still simultaneously leaving the barrels). I think that would make the two balls and chain whirl through the air, spinning with a sinister-sounding whoosh, perhaps becoming more accurate over distance due to rotational stability. I didn't describe that whoosh in my story, but maybe not all scytheguns would work exactly the same--perhaps some could fire straight and some rotate. Speaking of not being exactly the same, crude scytheguns of the sort I just made up would be fired by gunpowder cartridges, while fancy once would be powered by EMF--Electromotive Force, essentially mini magnetic catapults electrically hurling out a steel-balls-and-chain set.
I hope the above is helpful and makes sense. Please let me know if I can help with these ideas any more in the future.