Looking for a SP1 carbine barrel to set up an upper for my Fiance for my M16. I am looking for the chromed lined 1/12 twist light barrel. I plan to set it up for .223 and a Ciener .22lr kit that I have. Since it will be on a R.R. if it has been shortened that would be OK. I'm not interested in a barrel that is shot out, but it doesn't have to be NIB. Please let me know what you have and what you would like for it.