Hi jim'scider,
I have an M1 with three barrels and would like to find one like you have. One of the ones I have is the 18.5 inch tactical barrel. But I really don't want to get rid of it. Should you find you want to go ahead and sell yours, maybe drop me a note and let's talk about it.
I am in the Houston area, just so you know.
Thank you for your time and attention...
- Mark