Graycg and Paladin,
Thanks for the replies. I think I may have found the ID of the barrel now. Same flat bottemed lug. Handstamp is on the bottom of the lug, not the side. Also, mine had a single lug cut, which lined up with the front of the super 14 forearm spacing. I had a smith cut an extra lug in the back and put a bullberry hanger bar on it to use with my BBerry woodsets. Dropped about a 1/2 inch off the groups.
This one has the 11" angle cut crown on it as well.
It makes a great little lightweight walking around carbine barrel.
Buckenbass, in reference to your original question, I also have the Bullberry 223 20" full bull and both of these barrels shoot about the same, however the pencil barrel in more "picky" about the ammo. The newer heavy barrel shoots most ammo consistantly, while the older pencil barrel will move POI up to 3-4 inches for different bullet weights and powder charges. The HB just dampens the harmonics better than the thinner barrel.
Joe