16" sporter contour. It has an odd, very slight OD reduction starting maybe 6-7 inches short of the muzzle.
Threaded BTW, and it looked weird to me being so short, so I put a $15 ebay muzzle brake on it just to get some length.
Ill post a pic and set up a link.
Also, it has a counterbore at the crown, and when I scrubbed the barrel with CLP & a brass brush, the finish came off the counterbore, and I assume the bore as well.
The barrel finish wasn't affected by CLP on the outside.
https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/galleries/14557817#Post14557817