I just pulled a .308 stainless sporter barrel off of a Remington 700 this morning. It's brand new, never a round through it. $100 o.b.o. plus shipping. PM me here if interested.
Give White Cloud Custom Rifle a call he is a gunsmith in Phx AZ. His name is Dave.
He may have a take off barrel new or used if thats what your needing, just tell him his cousin Steve gave you his number.
602 292-1986
look at his web page! customrifleman.com
or where I work for optics and tripods. outdoorsmans.com