Is the end threaded?


The left end is square for about 1/4 inch.


If so, it might be a tow worm, used to clean
muzzle loading firearms with tow (coarse, rough fibers, such as flax,
hemp or jute) when attached to the ram rod. From its size, would be for
a fairly small bore, .45 or smaller.
Couldn't find one just like it, most have MUCH tighter twists,
duplicating historical examples, but could be a modern variant.


I couldn't find any gun worms similar to this tool either, looks like it's still
a
mystery for now.