It's a factory barrel, but I'm pretty sure it's close to a #3 contour. I'll measure when I get home today after work. Seems like it was around 0.65" at the muzzle, though. (I was measuring a bunch of them last week trying to decide if I wanted a #2 or a #3 for a sporter build I was starting). I'll post and let you know for sure, though.
Brian