I was hunting around the web for some Timothy Murphy stuff I'm working on, and stumbled across this little gem :) be sure to download the audio file.
Enjoy!
http://www.saratogaaoh.com/Murphy.html
Thanks. Cute lyrics.
I had never heard of a double-barreled Kentucky rifle, but one that exists is in the NRA museum. An over/under affair with a rotating barrel
https://youtu.be/kZVux0mXUWo
as for the historical record on the event versus the Murphy Myth.... see here.
https://allthingsliberty.com/2013/03/the-myth-of-rifleman-timothy-murphy-and-the-power-of-the-written-word/