Looking to sell my Colt upper. Currently on it is a JP-enterprise adjustable gas block for suppressor use & I switched out the handguard with a Geissele Mk4 13.5 in. It was painted with Duracoat as part of a project, but now I'm looking to part with it. Only has less than 200 rounds through it, shoots & works as intended. Text me at 717-781-5458 if you're interested.