Flint,
Don't cut that old barrel down.
I've got a 20.5" 12 ga. shorty barrel. I lathe cut it and had a large bead installed. The barrel is duracoated but it's chipping at the muzzle.
Chamber and bore are perfect.
Here's the deal. I'll send it to you to try on your frame. If it fits KEEP IT. If it don't fit send it back. Simple as that. I am not selling it to you... if it fits it's yours FREE.
I've gotten lots of use out of it and now it's time for someone else to get some use out of it.
If you're interested let me know and I'll send it out to you.
Spanky