Colt does, but they are $495.00. I have a Bushy 1/9, Chromed, 11.5" HBAR that I had turned down to superlight contour & had the bayo lug removed. Less than 140rds thru it. $215.00 shipped. Will send pics if your interested.
http://www.nfaoa.org/phpBB2/ It is a free board that is fighting to protect our gun rights. Check em out.