I want to sell this barrel or will consider trades for ammo. It came off a Colt rifle that I bought new prior to the ban sunset. It has a little over 1000 rounds through it. It is an HBAR profile and only the chamber is chrome lined. It is a 1/9 twist. It is marked "C MP 5.56 NATO 1/9 HBAR" on the barrel. It is in great condition. I replaced it with a CMMG barrel and therefore don't need it any more. It is a very accurate barrel and seems to really like the 75 grain loads.
I can email pics if requested.