The D/W barrel is 14" and as stated takes freak inserts. Bore size can be matched to fit paint if you have insert kit. Check out link to Deadlywind for more info..how long is that CF barrel? is it the norm .069 bore or whatever they normally are?
cheers
http://store.deadlywind.com/product/a52da757-bb49-4c95-891b-4e1953742e12.aspx