Got this ff tube with my upper and switched it out to a YHM ff tube so it has never seen any use. I am always down to trade something fun for my AR. What ya got, make some offers. Not sure the exact value of it but try and find one for sale from a dist. and see what it comes up as to compare.
It has vents at the back of it and knurling in the center, black. Comes with barrel nut mount, everything you need to mount it. Email me for pics of it.
Hit me up.http://i38.photobucket.com/albums/e115/Leviticus_g/DSC03704.jpg