I just ordered one. According to the website they have 66 left. I think these are new, I couldn't find any reviews. So they might be good barrels or they might be junk. Here are the specs:

Grey phosphate finish
- 20 inch length
- A1 "pencil" profile
- 1 in 7 twist
- Caliber 5.56 NATO
- Chrome lined
- With gas hole and barrel extension.

Here's the link
http://store.mckay-ent.com/parts/m16...nt-barrel.html