what kind of barrel is this?

[automag_holder]

After a five year break i'm getting back into mags. This is one of my old mags and sold this barrel and i want to get another one. All i can remember is that it shot great and it was a one piece 12" barrel.

http://i81.photobucket.com/albums/j220/automag_holder/709447-R1-08-13.jpg

[captian pinky]

pretty sure it was a 32 degrees but not 100 %