From the world of air rifles and BB guns, I read about making a different version - home made. I think it’s similar to what John292 posted above:
- Thick heavier grade replacement grass/weed trimmer line (from the hardware store)
- Wide enough to cut a hole in it, thin enough to fit your barrel
- Cut it longer than the barrel for enough levarage
- Run a patch thru the hole in the cord
- Use a drinking straw to guide the it into the barrel, non patch in first, patch end at the end
- Pull it through
- Now, no excuse not to safety inspect and clean your barrels at the range or hunting
- No need for washing a bore snake
I’ve not figured out a way to add bristles/brush yet.